<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1794-4449</journal-id>
<journal-title><![CDATA[Revista Lasallista de Investigación]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Lasallista Investig.]]></abbrev-journal-title>
<issn>1794-4449</issn>
<publisher>
<publisher-name><![CDATA[Corporación Universitaria Lasallista]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1794-44492012000200017</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Yogur en la salud humana]]></article-title>
<article-title xml:lang="en"><![CDATA[Yogurt and human health]]></article-title>
<article-title xml:lang="pt"><![CDATA[Iogurte na saúde humana]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parra Huertas]]></surname>
<given-names><![CDATA[Ricardo Adolfo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Pedagógica y Tecnológica de Colombia Facultad de Ciencias Básicas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2012</year>
</pub-date>
<volume>9</volume>
<numero>2</numero>
<fpage>162</fpage>
<lpage>177</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1794-44492012000200017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1794-44492012000200017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1794-44492012000200017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El yogur es un alimento funcional, un derivado lácteo obtenido por fermentación de bacterias ácido lácticas de la leche. Desde la antigüedad es ampliamente conocido los efectos en la salud humana del yogur, entre ellos figuran: prevención de cáncer de colon, disminución de colesterol, mejoramiento de la flora intestinal, efectos en el sistema inmune y prevención de helicobacter pylori, entre otros. Las bacterias responsables de estos efectos son las bacterias ácido-lácticas-probióticas como Bifidobacterias, Streptococcus y principalmente Lactobacillus.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Yogurt is a functional food, a fermented dairy product obtained because of the fermentation of the acidlactic bacteria of the milk. It has been widely known through many years for its effects on human health, among which colon cancer prevention, reduction oficholesterol, improvement of the intestinal bacteria,effects on the immune system and prevention of helicobacter pylori, among others, can be highlighted.The bacteria responsible for these effects are theacid-lactic-probiotic, such as bifid bacteria, streptococcusand, mainly, lactobacillus.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O iogurte é um alimento funcional, um derivado lácteo obtido por fermentação de bactérias ácido lácticas do leite. Desde a antiguidade é amplamente conhecido os efeitos na saúde humana do iogurte, entre eles figuram: prevenção de câncer de cólon, diminuição de colesterol, melhoramento da fora intestinal, efeitos no sistema imune e prevenção de helicobacter pylori, entre outros. As bactérias responsáveis destes efeitos são as bactérias ácido-lácticas-probióticas como Bifidobacterias, Streptococcus e principalmente Lactobacillus.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[yogur]]></kwd>
<kwd lng="es"><![CDATA[beneficios]]></kwd>
<kwd lng="es"><![CDATA[alimento]]></kwd>
<kwd lng="es"><![CDATA[probióticos]]></kwd>
<kwd lng="es"><![CDATA[bacterias ácido-lácticas]]></kwd>
<kwd lng="en"><![CDATA[yogurt]]></kwd>
<kwd lng="en"><![CDATA[benefits]]></kwd>
<kwd lng="en"><![CDATA[food]]></kwd>
<kwd lng="en"><![CDATA[probiotics]]></kwd>
<kwd lng="en"><![CDATA[acid lactic bacteria]]></kwd>
<kwd lng="pt"><![CDATA[iogurte]]></kwd>
<kwd lng="pt"><![CDATA[benefícios]]></kwd>
<kwd lng="pt"><![CDATA[alimento]]></kwd>
<kwd lng="pt"><![CDATA[probióticos]]></kwd>
<kwd lng="pt"><![CDATA[bactérias ácido-lácticas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font face="verdana" size="2">      <p><b>Art&iacute;culo de revisi&oacute;n / Review article / Artigo de revis&atilde;o</b></p>      <p align="center"><font size="4"><b>Yogur en la salud humana</b></font></p>     <p align="center"><font size="3"><b>Yogurt and human health</b></font></p>     <p align="center"><font size="3"><b>Iogurte na sa&uacute;de humana</b></font></p>     <p align="center">Ricardo Adolfo Parra Huertas<sup>*</sup></p>      <p><sup>*</sup> Docente investigador. Grupo de Investigaci&oacute;n en Qu&iacute;mica y Tecnolog&iacute;a de Alimentos. Universidad Pedag&oacute;gica y Tecnol&oacute;gica de Colombia. Facultad de Ciencias B&aacute;sicas. Qu&iacute;mica de Alimentos.    <br> Correspondencia: <a href="mailto:ricardo.parra@uptc.edu.co">ricardo.parra@uptc.edu.co</a></p>      <p>Art&iacute;culo recibido 01/07/2011; art&iacute;culo aprobado: 15/11/2012</p> <hr>      <p><font size="3"><b>Resumen</b></font></p>      ]]></body>
<body><![CDATA[<p>El yogur es un alimento funcional, un derivado l&aacute;cteo obtenido por fermentaci&oacute;n de bacterias &aacute;cido l&aacute;cticas de la leche. Desde la antig&uuml;edad es ampliamente conocido los efectos en la salud humana del yogur, entre ellos figuran: prevenci&oacute;n de c&aacute;ncer de colon, disminuci&oacute;n de colesterol, mejoramiento de la flora intestinal, efectos en el sistema inmune y prevenci&oacute;n de <i>helicobacter pylori, </i>entre otros. Las bacterias responsables de estos efectos son las bacterias &aacute;cido-l&aacute;cticas-probi&oacute;ticas como Bifidobacterias, Streptococcus y principalmente Lactobacillus.</p>      <p><b>Palabras clave</b>: yogur, beneficios, alimento, probi&oacute;-iticos, bacterias &aacute;cido-l&aacute;cticas</p> <hr>      <p><font size="3"><b>Abstract</b></font></p>      <p>Yogurt is a functional food, a fermented dairy product obtained because of the fermentation of the acidlactic bacteria of the milk. It has been widely known through many years for its effects on human health, among which colon cancer prevention, reduction oficholesterol, improvement of the intestinal bacteria,effects on the immune system and prevention of helicobacter pylori, among others, can be highlighted.The bacteria responsible for these effects are theacid-lactic-probiotic, such as bifid bacteria, streptococcusand, mainly, lactobacillus.</p>      <p><b>Key words: </b>yogurt, benefits, food, probiotics, acid lactic bacteria</p> <hr>      <p><font size="3"><b>Resumo</b></font></p>      <p>O iogurte &eacute; um alimento funcional, um derivado l&aacute;cteo obtido por fermenta&ccedil;&atilde;o de bact&eacute;rias &aacute;cido l&aacute;cticas do leite. Desde a antiguidade &eacute; amplamente conhecido os efeitos na sa&uacute;de humana do iogurte, entre eles figuram: preven&ccedil;&atilde;o de c&acirc;ncer de c&oacute;lon, diminui&ccedil;&atilde;o de colesterol, melhoramento da flora intestinal, efeitos no sistema imune e preven&ccedil;&atilde;o de helicobacter pylori, entre outros. As bact&eacute;rias respons&aacute;veis destes efeitos s&atilde;o as bact&eacute;rias &aacute;cido-l&aacute;cticas-probi&oacute;ticas como Bifidobacterias, Streptococcus e principalmente Lactobacillus.</p>      <p><b>Palavras importantes: </b>iogurte, benef&iacute;cios, alimento, probi&oacute;ticos, bact&eacute;rias &aacute;cido-l&aacute;cticas.</p> <hr>      <p><font size="3"><b>Introducci&oacute;n</b></font></p>      <p>Dentro de los alimentos funcionales o alimentos que promueven la salud de las personas se tienen barras de cereales para deportistas, helados de crema basados en leche, margarinas reductoras de colesterol, jugos de naranja, l&aacute;cteos o leches fortificados con calcio; sin embargo, productos como el yogur que contienen microorganismos como probi&oacute;ticos, los cuales pueden ser definidos como suplementos de microorganismos vivos que afectan ben&eacute;ficamente al hu&eacute;sped al mejorar el balance microbiano intestinal, est&aacute;n ganando r&aacute;pidamente atenci&oacute;n como alimentos funcionales<sup>1-3</sup>.</p>      ]]></body>
<body><![CDATA[<p>En relaci&oacute;n con los alimentos, los probi&oacute;ticos son considerados como preparaciones en alimentos o suplementos dietarios para mejorar la salud de humanos o animales. Dentro de ellos se encuentra el yogur, un alimento que ha crecido en popularidad a&ntilde;o tras a&ntilde;o debido, entre otros aspectos, a los beneficios percibidos en la salud. El yogur es uno de los alimentos l&aacute;cteos fermentados que contienen probi&oacute;ticos, los cuales, consumidos en cantidades suficientes, ejercen efectos ben&eacute;ficos en la poblaci&oacute;n microbiana del tracto gastrointestinal. Las bacterias que se encuentran en este producto son principalmente miembros del g&eacute;nero Lactobacillus y Bifidobacterium<sup>4,</sup> <sup>5</sup>. Esta revisi&oacute;n resumir&aacute; los principales efectos ben&eacute;ficos del consumo de yogur en la salud humana, a trav&eacute;s de las bacterias &aacute;cido-l&aacute;cticas-probi&oacute;ticas.</p>      <p>La Academia Nacional de Ciencia de los Estados Unidos ha definido los alimentos funcionales como "cualquier alimento o ingrediente alimenticio modificado, que pueda proporcionar un beneficio a la salud, superior al de los nutrientes tradicionales que contiene"<sup>6</sup>. Puede ser un alimento natural, un alimento al que se ha a&ntilde;adido, eliminado o modificado un componente por medios biotecnol&oacute;gicos, un alimento en el que se ha modificado la biodisponibilidad de uno o m&aacute;s de sus componentes o una combinaci&oacute;n de cualquiera de estas posibilidades<sup>7,</sup> <sup>8</sup>; como algunos ejemplos se tiene la leche y otros productos l&aacute;cteos, los cuales han sido reconocidos como alimentos desde &eacute;pocas antes de Cristo; as&iacute;, en &eacute;pocas de la historia romana, Plinio recomend&oacute; la utilizaci&oacute;n de leches fermentadas para el tratamiento de infecciones gastrointestinales<sup>9</sup>. Tambi&eacute;n en la historia romana, Tissier propuso a principios del a&ntilde;o 1900 del siglo pasado que las bifidobacterias podr&iacute;an prevenir infecciones en infantes, como componente predominante de la microflora intestinal en alimentos destinado para infantes. Metchnikoffen 1908, sugiri&oacute; que el consumo de leches fermentadas podr&iacute;a reversar efectos putrefactos de la microflora del intestino<sup>13</sup>.</p>      <p>Hist&oacute;ricamente, en las ra&iacute;ces culturales, las leyendas, las an&eacute;cdotas y los estudios cient&iacute;ficos han caracterizado los atributos saludables del yogur<sup>14</sup>. Pero fue solo a inicios del siglo XX donde la relevancia del yogur y su asociaci&oacute;n con la salud surgi&oacute; y tom&oacute; fuerza en Europa, debido a estudios realizados por el Instituto Pasteur, m&aacute;s exactamente por Metchnikoff.</p>      <p>Fue &eacute;l quien primero dio una explicaci&oacute;n de los efectos ben&eacute;ficos de las bacterias &aacute;cido-l&aacute;cticas (BAL) presentes en leches fermentadas, a trav&eacute;s de su teor&iacute;a de la "longevidad" en los pueblos balc&aacute;nicos asociada al alto consumo de productos fermentados basados en leche. El principio de esta teor&iacute;a se refer&iacute;a a que las BAL desplazan las toxinas producidas por bacterias, normalmente presentes en el intestino, prolongando la vida. Metchnikoff explic&oacute; que las mismas BAL y otros productos producidos por BAL en leches fermentadas preven&iacute;an el crecimiento y toxicidad de bacterias anaer&oacute;bicas formadoras de esporas en el intestino grueso<sup>15-17</sup>.</p>      <p>El t&eacute;rmino de probi&oacute;tico incluye una gran cantidad de microorganismos vivos, principalmente bacterias pero tambi&eacute;n levaduras. Dentro de estos grupos, las BAL son los m&aacute;s importantes probi&oacute;ticos conocidos que tienen efectos beneficiosos en el tracto gastrointestinal humano<sup>18 </sup>cuando son administrados en cantidades adecuadas<sup>19,</sup> <sup>20</sup>. Estos microorganismos probi&oacute;ticos pueden ser liberados al consumidor a trav&eacute;s de productos l&aacute;cteos fermentados los cuales son utilizados como veh&iacute;culos alimentarios para este fin<sup>21</sup>.</p>      <p>Los microorganismos probi&oacute;ticos aparecen en el tracto gastrointestinal del hombre desde etapas tempranas de la vida, pero al pasar el tiempo, y debido a factores como la edad, la dieta, el ambiente, el estr&eacute;s y la medicaci&oacute;n, descienden a cantidades que pueden llegar a ser muy peque&ntilde;as lo cual puede favorecer el crecimiento de bacterias pat&oacute;genas<sup>22</sup>.Otros factores que pueden influir en la viabilidad de los probi&oacute;ticos pueden ser: variaci&oacute;n de cepas, acumulaci&oacute;n de &aacute;cido, interacci&oacute;n con cultivos iniciadores, nivel de ox&iacute;geno disuelto y per&oacute;xido de hidr&oacute;geno, y condiciones de almacenamiento<sup>23</sup>.</p>      <p>Debido al aumento en la poblaci&oacute;n mundial, es importante la prevenci&oacute;n y tratamiento de enfermedades con el fin de maximizar la calidad de vida<sup>24,</sup> <sup>25</sup>. Al respecto, se ha observado <i>in vi-tro </i>e <i>in vivo </i>que los productos l&aacute;cteos fermentados con BAL (probi&oacute;ticos) tiene propiedades funcionales porque ayudan a incrementar la habilidad del cuerpo para resistir la invasi&oacute;n de pat&oacute;genos y mantener bien la salud del hu&eacute;sped. Los probi&oacute;ticos han sido muy utilizados en aplicaciones terap&eacute;uticas que incluyen: prevenci&oacute;n de enfermedades urogenitales (<i>candidal vaginitis</i>), protecci&oacute;n y prevenci&oacute;n contra la diarrea, control de enfermedades infamatorias del intestino como enfermedad de Crohn y pouchitis, s&iacute;ndrome del intestino irritable<sup>26-29</sup>, alivio de los s&iacute;ntomas de intolerancia a la lactosa, reducci&oacute;n del colesterol y reducci&oacute;n de la presi&oacute;n arterial. Otros beneficios incluyen la producci&oacute;n de enzimas, estabilizaci&oacute;n de la microflora, y reducci&oacute;n del riesgo de algunos c&aacute;nceres, especialmente el de colon<sup>30,</sup> <sup>31</sup>, prevenci&oacute;n de alergias alimentarias<sup>32-38</sup> y control, prevenci&oacute;n, y tratamiento de &uacute;lcera g&aacute;strica causada por <i>Helicobacter pylori</i><sup>39</sup>.</p>      <p>Es por lo anterior que para producir beneficios terap&eacute;uticos, los alimentos con probi&oacute;ticos que contienen bacterias vivas deben estar presentes a trav&eacute;s de la vida &uacute;til del producto, manteni&eacute;ndose estable y viable para permitir que el microorganismo pueda sobrevivir a las barreras defensivas naturales y al ecosistema del hospedador<sup>40,</sup> <sup>41</sup>. Al respecto, el "m&iacute;nimo terap&eacute;utico" de bacterias probi&oacute;ticas en leches fermentadas recomendadas podr&iacute;a estar en un rango de 105-106 UFC.mL<sup>42,43</sup>, de igual manera <sup>44,</sup> <sup>45</sup> mencionan que el consumo podr&iacute;a ser de m&aacute;s de 100 g por d&iacute;a de yogur que contenga m&aacute;s de 106 UFC.mL<sup>-1</sup>. Por lo anterior y por otras razones, bebidas como el yogur son uno de los alimentos m&aacute;s populares en el mundo<sup>46, 47</sup>y alcanzan una imagen saludable positiva debido a la acci&oacute;n ben&eacute;fica de estas bacterias<sup>48</sup>.</p>      <p><b>Selecci&oacute;n de probi&oacute;ticos</b></p>      <p>Para la selecci&oacute;n de microorganismos probi&oacute;ticos se debe tener en cuenta: que las cepas para la utilizaci&oacute;n humana sean preferiblemente de origen humano y aisladas del tracto gastrointestinal; adem&aacute;s, no deben tener un historial de patogenicidad ni asociaci&oacute;n con enfermedades y, por &uacute;ltimo, no deben transmitir resistencia gen&eacute;tica a antibi&oacute;ticos<sup>49,</sup> <sup>50</sup>; adem&aacute;s de lo anterior, se espera que los probi&oacute;ticos tengan las siguientes caracter&iacute;sticas (<a href="#fg1">figura 1</a>):</p>     ]]></body>
<body><![CDATA[<p align="center"><a name="fg1"></a><img src="img/revistas/rlsi/v9n2/v9n2a17fg1.jpg"></p>      <p>(1) F&aacute;cil reproducibilidad, (2) Capacidad para sobrevivir en condiciones ambientales en la que act&uacute;an, (3) gen&eacute;ticamente estable.(4) La ausencia de toxinas y reacciones cancer&iacute;genas, (5) Capacidad para seguir siendo viable durante la elaboraci&oacute;n y (6) Capacidad para fijarse y colonizar el lugar donde est&aacute;n activos<sup>51</sup>.</p>      <p><b>Tipos de bacterias&aacute;cido-l&aacute;cticas</b></p>      <p>Dentro de las BAL m&aacute;s utilizadas como bacterias probi&oacute;ticas se encuentran el g&eacute;nero Lactobacillus como: <i>&aacute;cidophillus, casei</i>, <i>lactis</i>, <i>helviticus</i>, <i>salivarius</i>, <i>plantrum</i>, <i>bulgaricus</i>, <i>ramnosus</i>, <i>johnsonii</i>, <i>reuteri</i>, <i>fermentum </i>y <i>Lactobacillusdelbrueckii</i>,  otros  microorganismos son: Streptococcusthermophilus, Pediococcus, Enterococcusfaecium, Bifidobacteriumbifidum, Bifidobacteriumlactis, Bifidobacterium. Brevey Bifidobacterium Longum<sup>53-56</sup>, de estas bacterias, los Lactobacillus, Streptococcus y Bifidobacteriasson los grupos m&aacute;s utilizados comoprobi&oacute;ticos en la elaboraci&oacute;n de bebidas l&aacute;cteas fermentadas como el yogur<sup>57,58</sup>.</p>     <p align="center"><a name="t1"></a><img src="img/revistas/rlsi/v9n2/v9n2a17t1.jpg"></p>      <p><b>Mecanismo de acci&oacute;n</b></p>     <p>Los mecanismos que pueden estar implicados en la acci&oacute;n de los probi&oacute;ticos en la salud humana incluyen:</p>  <ul>    <li> La producci&oacute;n de sustancias inhibitorias/ antimicrobianas como: &aacute;cidos org&aacute;nicos, per&oacute;xido de hidr&oacute;geno, bacteriocinas, antibi&oacute;ticos y &aacute;cidos biliares<sup>60-62</sup>.</li>     <li> Actuaci&oacute;n como antagonista competitivo, por ejemplo, competici&oacute;n por la adhesi&oacute;n de sitios y nutrientes<sup>63</sup>.</li>     <li>Estimulacion del sistema inmune<sup>64</sup>.</li>    ]]></body>
<body><![CDATA[</ul>      <p>Harish y Varghese<sup>65</sup> mencionan otros posibles mecanismos como: mejoramiento de las funciones de la barrera intestinal, control en la transferencia de ant&iacute;genos dietarios, y estimulaci&oacute;n de la mucosa e inmunidad sist&eacute;mica del hu&eacute;sped.</p>      <p>A continuaci&oacute;n se explican las principales propiedades funcionales del yogur que contiene probi&oacute;ticos, en la salud humana:</p>      <p><b>Microflora intestinal</b></p>      <p>El intestino est&aacute; formado por un ecosistema microbiano complejo que tiene funciones metab&oacute;licas espec&iacute;ficas y protectoras. La disrupci&oacute;n de esta microecolog&iacute;a altera la homeostasis del hu&eacute;sped, contribuyendo al deterioro intestinal. La relaci&oacute;n simbi&oacute;tica supone la presencia de una microbiota balanceada para el normal desarrollo del intestino y para una defensa eficaz contra bacterias invasoras<sup>66</sup> o bacterias pat&oacute;genas tales como <i>salmonela, shiguella </i>y <i>Helicobacter, </i>entre otras<sup>67</sup>.</p>      <p>Dentro de las principales funciones de la microflora intestinal se incluyen actividades metab&oacute;licas que resultan en la recuperaci&oacute;n de energ&iacute;a y nutrientes absorbibles, efectos sobre el epitelio intestinal y protecci&oacute;n del hu&eacute;sped contra invasi&oacute;n por microorganismos pat&oacute;genos<sup>68</sup>.</p>      <p>La microflora intestinal est&aacute; compuesta de microorganismos que est&aacute;n clasificados como patog&eacute;nicos, neutrales o beneficiosos al hu&eacute;sped. Este &uacute;ltimo grupo de bacterias est&aacute;n com&uacute;nmente incluidas principalmente en derivados l&aacute;cteos, como yogur, helados y queso los cuales son aceptados como veh&iacute;culos de transporte<sup>69</sup>. Estos microorganismos que est&aacute;n contenidos en los productos mencionados anteriormente llegan hasta el tracto intestinal humano que alberga una comunidad microbiana de m&aacute;s de 400 especies, la mayor&iacute;a de ellas anaer&oacute;bicas. El 99% de la microbiota total consiste solamente de 30-40 g&eacute;neros bacterianos diferentes<sup>70</sup>, principalmente: bacteroides, eubacterias, bifidobacterias, <i>enterobacterias, streptococcus, Lactobacillus </i>y <i>Clostridium</i><sup>71-74</sup>.</p>      <p>Seg&uacute;n Hoolihan<sup>75</sup>, el tracto intestinal humano contiene 10<sup>14</sup> c&eacute;lulas bacterianas; lo anterior es 10 veces m&aacute;s el n&uacute;mero de c&eacute;lulas que comprenden el cuerpo humano; sin embargo, algunos factores modifican esta microbiota intestinal; dentro de ellos se destacan: cambios de dieta, sexo, edad, requerimientos nutricionales e inmunol&oacute;gicos, utilizaci&oacute;n de antibi&oacute;ticos, estr&eacute;s, consumo de alcohol, pH, tiempo de tr&aacute;nsito del material en el interior del intestino, la cantidad y tipo de material fermentable (por ejemplo sustrato de crecimiento)<sup>76</sup>, estado de salud del individuo y naturaleza de la flora<sup>77</sup>. Sumado a lo anterior, la microflora intestinal se ve afectada tambi&eacute;n por disturbios gastrointestinales seguido por infecciones o invasi&oacute;n de pat&oacute;genos transmitida por alimentos. Al respecto, las BAL probi&oacute;ticas pueden obstaculizar la colonizaci&oacute;n y subsecuentemente la proliferaci&oacute;n de los pat&oacute;genos, debido a que tienen un potencial para producir toxinas (sustancias antimicrobianas) en el tracto gastrointestinal<sup>78,79</sup>.</p>      <p><b>Diarrea</b></p>      <p>M&aacute;s de 2 d&eacute;cadas atr&aacute;s, la Organizaci&oacute;n Mundial de Salud estim&oacute; anualmente 800 Millones de episodios de diarrea y 4.6 Millones de muertes entre ni&ntilde;os y j&oacute;venes en pa&iacute;ses desarrollados. La diarrea es problema com&uacute;n entre ni&ntilde;os en todo el mundo, y se reporta que contribuye sustancialmente a visitas pedi&aacute;tricas y hospitalizaci&oacute;n<sup>80</sup>. La diarrea es entonces definida como un cambio en el tr&aacute;nsito intestinal de un individuo, caracterizada por un aumento en el contenido l&iacute;quido, volumen y frecuencia de las deposiciones. La terapia m&aacute;s importante para la diarrea aguda asociada a deshidrataci&oacute;n es la rehidrataci&oacute;n oral; sin embargo, esta no produce una disminuci&oacute;n sustancial de la duraci&oacute;n del episodio diarreico ni tampoco una disminuci&oacute;n del volumen de las deposiciones<sup>81</sup>. Es por lo anterior que desde principios del siglo XX, los cultivos bacterianos vivos utilizados en la fermentaci&oacute;n de productos l&aacute;cteos, tales como el yogur, han sido utilizados en la prevenci&oacute;n y tratamiento de diarrea asociada con antibi&oacute;ticos en ni&ntilde;os y adultos<sup>82-89</sup>.</p>      ]]></body>
<body><![CDATA[<p>Teniendo en cuenta lo anterior, se han realizado estudios donde se demuestra que las <i>bifidobacterias </i>y <i>Streptococcus thermophilus </i>en leches fermentadas disminuyen considerablemente el riesgo de diarreas en infantes<sup>90,</sup> <sup>91</sup>.</p>      <p>En otros estudios recientes se ha encontrado que la terapia utilizando cepas de <i>bifibobacterium y Lactobacillus </i>como <i>ramnosus, casei y reuteri </i>ofrece una seguridad y medida efectiva en el tratamiento infeccioso de diarrea en ni&ntilde;os, siempre y cuando se administre al inicio de la enfermedad<sup>92-94</sup>. Al respecto, existen otras evidencias cient&iacute;ficas que sugieren que <i>Lactobacillus </i>en contenidos de leches fermentadas pueden ser m&aacute;s eficaces para el tratamiento de des&oacute;rdenes gastrointestinales que la administraci&oacute;n de antibi&oacute;ticos<sup>95-97</sup>.</p>      <p><b>Helicobacter pylori (efecto gastro-protector)</b></p>      <p>El <i>Helicobacter pylori </i>(<i>H. pylori</i>) es una bacteria Gram negativa que se encuentra principalmente en la capa de la mucosa g&aacute;strica o adherida al revestimiento epitelial del est&oacute;mago<sup>98,99</sup>, lo anterior causa infamaci&oacute;n de la mucosa g&aacute;strica fomentando la secreci&oacute;n de &aacute;cido g&aacute;strico y la persistente infecci&oacute;n que provoca, gastritis cr&oacute;nica o aguda y &uacute;lcera p&eacute;ptica<sup>100-105</sup>.</p>      <p>Generalmente esta bacteria se adquiere en la infancia, siguiendo un modelo de transmisi&oacute;n fecal-oral, persiste a lo largo de la vida, y constituye un problema sanitario de gran envergadura, dado el importante costo para los servicios de salud que acarrea la patolog&iacute;a gastroduodenal relacionada con la infecci&oacute;n<sup>106</sup>.</p>      <p>Esta infecci&oacute;n por <i>H. pylori </i>est&aacute; reportada en m&aacute;s del 90% de pacientes con &uacute;lcera duodenal, donde su tratamiento involucra el empleo de antibi&oacute;ticos<sup>107</sup>; sin embargo, la utilizaci&oacute;n de estas sustancias para tratar esta infecci&oacute;n por <i>H. pylori </i>est&aacute; asociada con efectos adversos y frecuentemente provoca resistencia a terapia de antibi&oacute;ticos<sup>108,</sup> <sup>109</sup>. Es por lo anterior que estudios han demostrado que:</p>  <ol type="1">    <li> <i>Lactobacillus salivarius </i>es capaz de producir elevadas cantidades de &aacute;cido l&aacute;ctico en el est&oacute;mago, lo que estimular&iacute;a la producci&oacute;n de prostaglandinas end&oacute;genas que act&uacute;an como mecanismos de defensa con efecto protector de la mucosa g&aacute;strica<sup>110.</sup></li>     <li><i>Lactobacillus salivarius </i>inhibe la colonizaci&oacute;n de <i>H. pylori</i>; esto es demostrado en estudios <i>in vitro</i>, ratones, y tambi&eacute;n en humanos donde la inhibici&oacute;n de microorganismos consumiendo yogur con <i>Lactobacillus. johnsonii</i>, bifibobacterias<sup>111,112</sup>, <i>Lactobacillus </i>&aacute;cido <i>philus </i>y <i>Bifidobacterium</i>, mejor&oacute; la velocidad de erradicaci&oacute;n de <i>H. pylori </i>en pacientes infectados<sup>113.</sup></li>     <li><i>Lactobacillus reuteri </i>posee una prote&iacute;na en su superficie celular que inhibe la uni&oacute;n del <i>H. pylori </i>a los receptores de glicol&iacute;pidos de membrana, lo que da lugar a una competencia por el receptor que impide la colonizaci&oacute;n por dicha bacteria<sup>114.</sup></li>     <li>La inhibici&oacute;n del crecimiento de <i>H. pylori </i>ocurre como resultado de la producci&oacute;n de &aacute;cidos org&aacute;nicos por cepas de <i>Lactobacillus </i>&aacute;cido <i>philus </i>in vitro<sup>115</sup>, as&iacute; como el g&eacute;nero <i>Lactobacillusgasseri</i>y<i>Lactobacilluscasei-cepaShirota</i><sup>116.</sup></li>    ]]></body>
<body><![CDATA[</ol>      <p>Una posible explicaci&oacute;n del efecto antag&oacute;nico de estos estudios ser&iacute;a la inducci&oacute;n de prostaglandinas end&oacute;genas como respuesta a la producci&oacute;n de elevadas cantidades de &aacute;cido l&aacute;ctico en el est&oacute;mago; otros mecanismos a&uacute;n no descritos actuar&iacute;an como mecanismos de defensa con efecto protector de la mucosa g&aacute;strica<sup>117</sup>.</p>      <p><b>S&iacute;ntesis y biodisponibilidad de nutrientes</b></p>      <p>La acci&oacute;n de los microorganismos en el tracto digestivo ha demostrado que mejora la cantidad, disponibilidad y digestibilidad de algunos nutrientes de la dieta. De igual manera, la fermentaci&oacute;n de los alimentos con BAL ha demostrado que aumenta el &aacute;cido f&oacute;lico en el yogur, la leche y el k&eacute;fr; al mismo tiempo, los niveles de niacina y ribofavina en el yogur son incrementados con este tipo de fermentaci&oacute;n. Las BAL son conocidas por liberar varias enzimas y vitaminas en el lumen intestinal, ejerciendo efectos sin&eacute;rgicos en la digesti&oacute;n y aliviando los s&iacute;ntomas de la mala absorci&oacute;n intestinal<sup>118</sup>.</p>      <p>Otro efecto es la hidr&oacute;lisis enzim&aacute;tica bacteriana donde se puede mejorar la biodisponibilidad de prote&iacute;na, disponibilidad de grasa y aumentar la producci&oacute;n de amino&aacute;cidos libres, &aacute;cidos grasos de cadena corta (AGCC), &aacute;cido l&aacute;ctico, propi&oacute;nico y &aacute;cido but&iacute;rico, todos ellos producidos por BAL<sup>119</sup>.</p>      <p><b>Colesterol</b></p>      <p>El colesterol es una sustancia cerosa que es componente natural de todas las c&eacute;lulas del cuerpo humano<sup>120</sup>. Biol&oacute;gicamente es importante porque desempe&ntilde;a varios roles vitales, incluyendo precursor para la s&iacute;ntesis de esteroides humanos, &aacute;cidos biliares y manteniendo estructura de membranas, y nervios aislantes; sin embargo, una dieta alta en grasas o niveles excesivamente altos origina una acumulaci&oacute;n de colesterol en el cuerpo humano<sup>121</sup>.</p>      <p>Es por lo anterior que existe un incremento en la conciencia de que el colesterol y la salud est&aacute;n correlacionados; esto es debido a que el colesterol en altas concentraciones act&uacute;a como un factor de riesgo en obesidad abdominal, hiperglucemia, hipertensi&oacute;n<sup>122</sup>, c&aacute;ncer de colon, hipercolesteremia y enfermedades coronarias o cardiovasculares; respecto a esta &uacute;ltima enfermedad<sup>123</sup>, se sabe que el alto colesterol ha tenido v&iacute;nculos con el incremento en el n&uacute;mero de muertes relacionadas con enfermedades de coraz&oacute;n o aterosclerosis; de lo anterior se deriva que las enfermedades cardiovasculares son la causa m&aacute;s seria de muertes en la mayor&iacute;a de los pa&iacute;ses<sup>124</sup>.</p>      <p>Debido a los problemas de salud originados por el colesterol, Mann and Sporry fueron los primeros investigadores en demostrar que el consumo de leches fermentadas disminu&iacute;a el colesterol<sup>125</sup>.</p>      <p>La ingesti&oacute;n de BAL-probi&oacute;ticas podr&iacute;a ser un m&eacute;todo para disminuir concentraciones de colesterol en humanos. Al respecto, investigaciones han involucrado el papel de los probi&oacute;ticos en la prevenci&oacute;n del aumento del nivel de colesterol<sup>126,</sup> <sup>127</sup>. Como ejemplos de lo anterior se tienen estudios en animales como ratones, cerdos y h&aacute;msteres, que muestran reducci&oacute;n de colesterol en la sangre y el h&iacute;gado cuando se les administr&oacute; leches fermentadas con <i>lactobacillus </i>y <i>lactococcus</i><sup>128-131</sup>.</p>      ]]></body>
<body><![CDATA[<p>Otros estudios observacionales, realizados en la tribu Massai en Africa, revelaron niveles de colesterol inferiores al valor promedio normal. Este hecho se atribuy&oacute; al consumo de leches fermentadas, alimento b&aacute;sico de la tribu, siendo una cepa de <i>lactobacillus </i>la responsable de la fermentaci&oacute;n natural de la leche<sup>132</sup>.</p>      <p>Es por lo anterior que un particular &eacute;nfasis ha sido puesto en productos fermentados con microorganismos espec&iacute;ficos a los cuales, propiedades nutricionales, diet&eacute;ticas, terap&eacute;uticas<sup>133 </sup>y pr&aacute;cticas dietarias han sido modificadas para reducir el colesterol vinculando grandes consumos diarios de leches fermentadas (8 L/d)<sup>134</sup>; otros autores tambi&eacute;n mencionan que consumiendo grandes cantidades de yogur se han disminuido niveles de colesterol en humanos<sup>135,136</sup>.</p>      <p>La habilidad in vitro de reducci&oacute;n de nivel de co-lesterol en modelos de medios de cultivo ha sido demostrada por numerosas cepas de BAL entre los cuales se encuentran: <i>Lactobacillus &aacute;cidophillus, Lactobacillus </i>d<i>elbrueckii</i>subsp<i>. bulgaricus</i>, <i>Lactobacillus casei</i>, <i>Lactobacillus gasseri</i>, <i>Lactobacillus Amylovoru. Bifidobacterium </i>(<i>bifidum</i>, <i>longum</i>), <i>Streptococcus </i>(<i>salivarius </i>subsp. <i>thermophilus</i>) y <i>Enterococcus </i>(<i>faecium</i>), as&iacute; como <i>Lactococcus </i>(<i>Lc. lactis </i>subsp. <i>lactis</i>, <i>Lc. lactis </i>subsp. <i>lactis </i>var. <i>diacetylactis</i>) y <i>Leuconostoc mesenteroides </i>subsp. <i>Mesenteroides</i><sup>137</sup>.</p>      <p>Los mecanismos exactos por los cuales las bacterias probi&oacute;ticas reducen niveles de co-lesterol son a&uacute;n desconocidos<sup>138</sup><i>; </i>sin embargo, recientemente se han mencionado los posibles mecanismos responsables de la reducci&oacute;n de colesterol por bacterias; los m&aacute;s importantes son las siguientes:</p>  <ul>    <li> Desconjugaci&oacute;n de bilis, sales biliares y dep&oacute;sitos de colesterol.</li>     <li> Hidr&oacute;lisis de sales biliares y uni&oacute;n con la bilis y carencia de reabsorci&oacute;n de bilis.</li>     <li> Absorcion incrementada de colesterol por la bacteria<sup>139</sup>.</li>    </ul>      <p><b>C&aacute;ncer</b></p>      <p>El c&aacute;ncer es causado principalmente por la mutaci&oacute;n o activaci&oacute;n de ciertos genes que controlan el crecimiento y la multiplicaci&oacute;n celular, y es en este punto donde act&uacute;an los microorganismos probi&oacute;ticos, disminuyendo la absorci&oacute;n y producci&oacute;n de sustancias mutag&eacute;nicas y carcin&oacute;genas<sup>140</sup>.</p>      ]]></body>
<body><![CDATA[<p>Reportes de varios estudios en animales mencionan que el consumo de yogur que contenga bacterias probi&oacute;ticas inhibe la formaci&oacute;n y proliferaci&oacute;n de tumores<sup>141,</sup> <sup>142</sup>. En otros estudios epidemiol&oacute;gicos se sugiere que las leches fermentadas suprimen el comienzo de carcinog&eacute;nesis y que la alteraci&oacute;n en microbiota intestinal es aparentemente responsable para el atributo anticarcinog&eacute;nico. Modelos de animales utilizados para delinear el papel anticarcinog&eacute;nico pueden estar divididos en prevenci&oacute;n de iniciaci&oacute;n de c&aacute;ncer y supresi&oacute;n de tumores iniciales<sup>143</sup>. Bakalinsky; <i>et al.</i><sup>144</sup> mencionan al respecto que el consumo de estas leches o bacterias utilizadas para la producci&oacute;n ha inhibido el crecimiento de ciertos tipos de tumores en ratones y ratas, y en humanos.</p>      <p>Diferentes tipos de c&aacute;ncer han sido tratados con cultivos probi&oacute;ticos; a continuaci&oacute;n se explican algunos de ellos:</p>      <p><b>C&aacute;ncer colon-rectal</b></p>      <p>El colon es la primera parte del intestino grueso que absorbe agua y nutrientes de los alimentos, y sirve como un lugar de almacenamiento para residuos s&oacute;lidos. El c&aacute;ncer colon-rectal se desarrolla en el sistema digestivo, que es el mecanismo principal para el procesamiento de alimentos, producci&oacute;n de energ&iacute;a y eliminaci&oacute;n de residuos s&oacute;lidos<sup>145</sup>. Este tipo de c&aacute;ncer es una causa importante de muerte en el mundo occidental. Aproximadamente el 70% de personas con este tipo de c&aacute;ncer est&aacute; asociado a factores ambientales, probablemente sobre todo la dieta<sup>146</sup>. La mayor&iacute;a de los c&aacute;nceres de colon surgen a partir de p&oacute;lipos que comienzan a crecer en el revestimiento interno del colon o del recto. Al respecto, los estudios han mostrado que los productos l&aacute;cteos fermentados previenen el c&aacute;ncer colon rectal<sup>147</sup>.</p>      <p>Teniendo en cuenta lo anterior se han realizado diferentes estudios y se ha detectado que leches fermentadas desempe&ntilde;an un papel protector contra el c&aacute;ncer de colon disminuyendo el riesgo despu&eacute;s de la ingesti&oacute;n de leches fermentadas<sup>148</sup>. Tambi&eacute;n otros autores han demostrado que algunos probi&oacute;ticos pueden disminuir las concentraciones fecales de enzimas y sales biliares secundarias que pueden estar involucradas en carcinog&eacute;nesis de colon<sup>149</sup>.</p>      <p>Otros estudios indican que los probi&oacute;ticos ser&iacute;an de utilidad en prevenir el c&aacute;ncer de colon, mediante la producci&oacute;n de &aacute;cidos grasos de cadena corta, los cuales acidifican el medio ambiente, asoci&aacute;ndose a un riesgo de c&aacute;ncer menor<sup>150,</sup> <sup>151</sup>.</p>      <p>Un reciente estudio ha encontrado que la suplementaci&oacute;n dietaria con cepas de <i>Lactobacillus </i>&aacute;cido <i>phillus </i>suprime el n&uacute;mero total de c&eacute;lulas de c&aacute;ncer de colon en ratas, reduciendo la incidencia y n&uacute;mero de tumores en animales artificialmente inducidos con c&aacute;ncer de colon<sup>152</sup>.</p>      <p><b>C&aacute;ncer de vejiga</b></p>      <p>En algunos estudios realizados sobre el c&aacute;ncer de vejiga, se ha demostrado el antagonismo entre las c&eacute;lulas tumorales y los probi&oacute;ticos. Lo anterior ha sido observado en individuos a los que se hab&iacute;a extirpado el tumor y se hab&iacute;a sometido a una posterior administraci&oacute;n de probi&oacute;ticos; como resultados, la reaparici&oacute;n del c&aacute;ncer fue m&aacute;s lenta y tard&iacute;a respecto de los individuos que no ingirieron estas sustancias tras la intervenci&oacute;n quir&uacute;rgica<sup>153</sup>.</p>      <p>Datos de estudios en animales y recurrencia de c&aacute;ncer de vejiga han sugerido que el consumo de productos l&aacute;cteos con BAL, como el yogur, desempe&ntilde;a un papel en la reducci&oacute;n de carcinog&eacute;nesis de vejiga<sup>154,</sup> <sup>155</sup>; al respecto, existen varias evidencias de estudios en animales in vitro, que bacterias probi&oacute;ticas reducen el riesgo de c&aacute;ncer al contrarrestar efectos mutag&eacute;nicos y genot&oacute;xicos<sup>156</sup>. Una de las pruebas cl&iacute;nicas humanas mostraron que el consumo de <i>Lactobacillus casei </i>(10 unidades formadoras de colonia UFC, tres veces por d&iacute;a por un a&ntilde;o<sup>10</sup>) disminu&iacute;a la recurrencia de c&aacute;ncer de vejiga<sup>157</sup>.</p>      ]]></body>
<body><![CDATA[<p><b>C&aacute;ncer de seno</b></p>      <p>El c&aacute;ncer de seno es uno de los c&aacute;nceres m&aacute;s comunes en la mujer. Estudios previos han mostrado que las leches fermentadas por <i>Lactobacillus helveticus </i>son capaces de retrasar el crecimiento de tumores y que la administraci&oacute;n oral de leches fermentadas podr&iacute;a modificar las poblaciones celulares inmunes en sitios distantes de la mucosa y mantener estas c&eacute;lulas en estado de alerta<sup>158</sup>;igualmente la bacteria <i>Bifidobacterium longum </i>tambi&eacute;n ha mostrado inhibir la incidencia de tumores mamarios, intestino delgado e h&iacute;gado en ratas<sup>159</sup>.</p>      <p><b>Intolerancia a la lactosa</b></p>      <p>La mayor&iacute;a de los adultos asi&aacute;ticos, africanos, americanos y nativos de Oriente Medio son intolerantes a la lactosa<sup>160</sup>; sin embargo, se sabe que esta intolerancia puede ser cong&eacute;nita causada por una deficiencia de la enzima &#946;-galactoxidasa, o lactasa, resultando as&iacute; en la imposibilidad de digerir la lactosa. En estos casos, la lactosa llega intacta al colon donde es fermentada por las bacterias de la flora col&oacute;nica con producci&oacute;n de agua, gas metano e hidr&oacute;geno, lo que da lugar a la sintomatolog&iacute;a t&iacute;pica de mala absorci&oacute;n de az&uacute;cares: fatulencia, dolor abdominal y diarrea acuosa<sup>161-163</sup>.</p>      <p>Generalmente las personas que no toleran la leche toleran el yogur. Lo anterior se debe, entre otras razones, a que el yogur contiene probi&oacute;ticos, principalmente <i>Lactobacillus</i>, que transforman la lactosa en &aacute;cidos org&aacute;nicos como el l&aacute;ctico y el ac&eacute;tico; a esto se le suma que algunos probi&oacute;ticos pueden producir &#946;-galactoxidasa despu&eacute;s de ser ingeridos oralmente, y pueden as&iacute; facilitar la digesti&oacute;n de lactosa en tramos altos del intestino delgado<sup>164,165</sup>.</p>      <p><b>Sistema inmune</b></p>      <p>La mayor&iacute;a de probi&oacute;ticos pueden ejercer efectos positivos sobre los sistemas inmunes sin provocar perjuicios a la respuesta infaamatoria<sup>166-168</sup>. Al respecto, varios estudios han demostrado que el <i>Lactobacillus &aacute;cido phillus </i>es capaz de aumentar la inmunidad del hu&eacute;sped mediante producci&oacute;n de colonias fuertes en el tracto intestinal, por lo que las bacterias pat&oacute;genas no ser&iacute;an capaces de realizar cualquier acto de destrucci&oacute;n en el cuerpo del hospedador<sup>169,</sup> <sup>170</sup>; adem&aacute;s de lo anterior, el consumo de BAL en leches fermentadas puede incrementar la respuesta sist&eacute;mica inmune as&iacute; como respuestas inmunes locales en c&eacute;lulas de tejidos mucosales en el intestino, bronquios y gl&aacute;ndula mamaria<sup>171</sup>, y a&uacute;n m&aacute;s si son consumidos juntos varios probi&oacute;ticos como es el caso de Lactobacillus y Bifidobacterias.</p>      <p><b>Infecciones del tracto vaginal</b></p>      <p>Las infecciones urogenitales de transmisi&oacute;n no sexual son muy comunes, cr&oacute;nicas, recurrentes, y normalmente son tratadas con antibi&oacute;ticos. Como alternativa para estas infecciones, se pueden se&ntilde;alar tres <i>lactobacillus </i>capaces de colonizar al hu&eacute;sped sin efectos adversos: <i>Lactobacillus rhamnosus, Lactobacillus fermentum </i>y <i>Lactobacillus crispatus</i><sup>172</sup>.</p>      <p>Al respecto, en un estudio reciente con cultivos de bacterias aisladas de mujeres con episodios recurrentes de la vaginosis bacteriana, cepas diferentes de <i>Lactobacillus </i>mostraron actividad inhibitoria contra las especies de bacterias causantes de esta enfermedad, posiblemente por la producci&oacute;n de medio &aacute;cido<sup>173</sup>.</p>      ]]></body>
<body><![CDATA[<p>Los mecanismos de acci&oacute;n que explicar&iacute;an este efecto se basan en la capacidad de los <i>lactobacillus </i>de adherirse y colonizar el tracto urogenital, previniendo e impidiendo el crecimiento de g&eacute;rmenes pat&oacute;genos; y en la producci&oacute;n de un ambiente &aacute;cido, que impide el crecimiento de otras especies bacterianas<sup>174</sup>.</p>      <p><b>Alergias</b></p>      <p>Las alergias son la respuesta del sistema inmunol&oacute;gico a una sustancia qu&iacute;mica en particular, inhalante (sustancias en el aire) o un alimento. Respecto a este &uacute;ltimo, las prote&iacute;nas de la leche de bovinos o el gluten pueden provocar una respuesta pro-infamatoria en el intestino por alteraci&oacute;n de la funci&oacute;n de la barrera intestinal<sup>175</sup>.</p>      <p>Aunque la investigaci&oacute;n es preliminar sobre c&oacute;mo los probi&oacute;ticos podr&iacute;an modular la reacci&oacute;n al&eacute;rgica, se sugiere que los probi&oacute;ticos pueden mejorar mecanismos end&oacute;genos de barrera del intestino, al reducir la infamaci&oacute;n intestinal y aliviar algunos s&iacute;ntomas de las alergias, y proporcionar as&iacute; herramientas &uacute;tiles para el tratamiento de alergias alimentarias<sup>176</sup>.</p>      <p>Al respecto se ha postulado que las bacterias probi&oacute;ticas podr&iacute;an prevenir esta disfunci&oacute;n intestinal, pero existe adem&aacute;s una relaci&oacute;n directa entre la funci&oacute;n del tejido linfoide asociado al intestino y la respuesta al&eacute;rgica. Los probi&oacute;ticos act&uacute;an: reduciendo la infamaci&oacute;n intestinal, corrigiendo el desbalance de linfocitos y estimulando a las citoquinas supresoras de los eventos pro-infamatorios del intestino<sup>177</sup>. Los <i>Lactobacillus</i>, a&ntilde;adidos a la dieta de infantes en f&oacute;rmulas de hidrolizados de lactosuero,han disminuido los s&iacute;ntomas de dermatitis<sup>178</sup>, infamaci&oacute;n intestinal y alivio de alergias alimenticias como aquellas asociadas con prote&iacute;nas de la leche (posiblemente al degradar estas prote&iacute;nas a peque&ntilde;os p&eacute;ptidos y amino&aacute;cidos)<sup>179,</sup> <sup>180</sup>.</p>      <p><b>S&iacute;ndrome de intestino irritable</b></p>      <p>La enfermedad infamatoria intestinal es un trastorno cr&oacute;nico recurrente en el que se observa una interacci&oacute;n an&oacute;mala de la flora intestinal y el hu&eacute;sped; esta enfermedad tiene su origen en una regulaci&oacute;n defectuosa entre la inmunidad de la mucosa intestinal y la microflora bacteriana, y ocurre en individuos gen&eacute;ticamente susceptibles<sup>181</sup>. Dentro de los trastornos por s&iacute;ndrome del intestino irritable est&aacute;n: colitis ulcerativa, enfermedad de pouchitis y Crohn<sup>182-184</sup>. Esta &uacute;ltima enfermedad es una condici&oacute;n cr&oacute;nica caracterizada por &aacute;reas irregulares de infamaci&oacute;n y heridas abiertas o &uacute;lceras a lo largo del tracto digestivo, relacion&aacute;ndose con la colitis ulcerativa<sup>185</sup>; al respecto Olveira; et al.<sup>186</sup> mencionan que los probi&oacute;ticos se han empleado en numerosos trabajos en modelos animales con resultados prometedores. En otros estudios en humanos, el empleo de un probi&oacute;tico multicepa, que conten&iacute;a cuatro cepas de <i>Lactobacillus: Lactobacillus &aacute;cidophilus, Lactobacillus casei, Lactobacillus del brueckii subespecie bulgaricus y Lactobacillus plantarum, </i>tres cepas de bifido bacterias<i>-Bifidobacterium longum, Bifidobac-terium infantis, Bifdobacterium breve- </i>y <i>Streptococcus salivarius </i>subespecie <i>thermophillus) </i>lograron aumentar el porcentaje de remisi&oacute;n de pouchitis en la colitis ulcerosa.</p>      <p>La administraci&oacute;n intracol&oacute;nica de <i>Lactobacillus reuteri </i>en ratas con colitis inducida significativamente ha disminuido esta enfermedad<sup>187,188</sup>. Por lo anterior, los probi&oacute;ticos contenidos en el yogur pueden ser sugeridos en personas con s&iacute;ndrome de intestino irritable<sup>189,190</sup>. Finalmente y para resumir las principales contribuciones de las bacterias &aacute;cido-l&aacute;cticas-probioticas que se encuentran en el yogur, se tiene la <A href="img/revistas/rlsi/v9n2/v9n2a17fg2.jpg" target="_blank">figura 2</a>.</p>      <p><font size="3"><b>Conclusiones</b></font></p>      <p>Debido al aumento en la poblaci&oacute;n mundial, es importante la prevenci&oacute;n y tratamiento de enfermedades y maximizar la calidad de vida. Al respecto, se ha observado <i>in vitro </i>e <i>in vivo </i>que los productos l&aacute;cteos fermentados con BAL (probi&oacute;ticos) tienen propiedades funcionales porque ayudan a incrementar la habilidad del cuerpo para resistir la invasi&oacute;n de pat&oacute;genos y mantener bien la salud del hu&eacute;sped. El t&eacute;rmino de probi&oacute;tico incluye una gran cantidad de microorganismos vivos, principalmente bacterias que tienen efectos beneficiosos en el tracto gastrointestinal humano, cuando son administrados en cantidades adecuadas. Dentro de este grupo se destacan el g&eacute;nero Lactobacillus como: <i>&aacute;cidophillus, casei</i>, <i>lactis</i>, <i>helviticus</i>, <i>salivarius</i>, <i>plantrum</i>, <i>bulgaricus</i>, <i>ramnosus</i>, <i>johnsonii</i>, <i>reuteri</i>, <i>fermentum </i>y <i>Lactobacillus delbrueckii</i>; otros microorganismos son: <i>Streptococcus thermophilus</i>, <i>Pediococcus</i>, <i>Enterococcus faecium</i>, <i>Bifidobacterium bifidum</i>, <i>Bifidobacterium lactis, Bifdobacterium breve </i>y <i>Bifidobacterium Longum</i>; de estas bacterias, los <i>Lactobacillus, Streptococcus </i>y <i>Bifidobacterias </i>son los grupos m&aacute;s utilizados como probi&oacute;ticos en la elaboraci&oacute;n de bebidas l&aacute;cteas fermentadas como el yogur. Aun cuando no se conozcan exhaustivamente las causas de algunas enfermedades, la experiencia documentada en la literatura y ensayos cl&iacute;nicos sugieren que cepas espec&iacute;ficas de probi&oacute;ticos pueden ser &uacute;tiles en la prevenci&oacute;n de la bacteria <i>Helicobacter pylori</i>, alergias, diarrea, c&aacute;ncer<i>, </i>control del s&iacute;ndrome de colon irritable, equilibrio de la microflora intestinal y disminuci&oacute;n de colesterol, entre otras. Sin embargo, el efecto terap&eacute;utico o preventivo sobre los efectos en la salud humana necesita de m&aacute;s estudios que demuestran m&aacute;s claramente los mecanismos y efectos concretos de cada uno de los probi&oacute;ticos, as&iacute; como la cantidad necesaria para producir el efecto probi&oacute;tico y las pautas para asegurar el tratamiento.</p> <hr>      ]]></body>
<body><![CDATA[<p><font size="3"><b>Referencias bibliogr&aacute;ficas</b></font></p>      <!-- ref --><p>1. HOLZAPFEL, W; <i>et al</i>. Taxonomy and important features of probiotic microorganisms in food and nutrition. En: <i>Am J. Clin Nutr. </i>2001. Vol. 73, p 365-373.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000114&pid=S1794-4449201200020001700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>2. CORT&Eacute;S, M.; CHIRALT, A. y PUENTE, L. Alimentos funcionales: una historia con mucho presente y futuro. En: Revista Vitae. 2005. Vol. 12,p. 5-14.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000116&pid=S1794-4449201200020001700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>3. GHADERI, M.; <i>et al</i>. The effect of novel probiotic on performance and serum concentrations of cholesterol and triglyceride in broiler chickens. En: African Journal of Biotechnology. 2010. Vol. 9, p. 7771-7774.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000118&pid=S1794-4449201200020001700003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>4. MAMDOH, O. and SULIMAN, A. Probiotics Bacteria in Fermented Dairy Products. En: Pakistan Journal of Nutrition. 2009. Vol. 8,p. 1107-1113.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000120&pid=S1794-4449201200020001700004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>5. HOOLIHAN, L. Prophylactic and therapeutic uses of probiotics: A review. En: Journal of the American Dietetic Association. 2001. Vol. 101, p. 229-241.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000122&pid=S1794-4449201200020001700005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>6. CORT&Eacute;S, M; <i>et al. </i>Op. 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<body><![CDATA[<!-- ref --><p>97.  GIRALD, M.; <i>et al</i>. Effects of probiotic lactobacillus casei dn-114 001 in prevention of radiation-induced diarrhea: results frommulticenter, randomized, placebo-controlled nutritional trial. En: Int. J. Radiation Oncology Biol. Phys. 2008. Vol. 71, N&deg; 4, p. 1213-1219.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000303&pid=S1794-4449201200020001700097&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>98.  MENNICKENT, S. y GREEN, K.; Op. Cit., p. 31-38.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000305&pid=S1794-4449201200020001700098&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>99.  ADOLFSSON, O.; MEYDANI, S. &amp; RUSSELL, R.; Op. Cit., p. 245-256.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000307&pid=S1794-4449201200020001700099&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>100. MENNICKENT, S. y GREEN, K. Op. Cit., p. 31-38&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000309&pid=S1794-4449201200020001700100&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>101. MIKI, K.; <i>et al</i>. Effect of Bifidobacterium bifdum Fermented Milk on Helicobacter pylori and Serum Pepsinogen Levels in Humans. En: J. Dairy Sci. 2007.Vol. 90, p. 2630-2640.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000310&pid=S1794-4449201200020001700101&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>102. ADOLFSSON, O.; MEYDANI, S. &amp; RUSSELL, R.; Op. Cit., p. 245-256.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000312&pid=S1794-4449201200020001700102&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>103. WANG, K; <i>et al</i>. Effects of ingesting Lactoba-cillus- and Bifdobacterium-containing yogur in subjects whith colonized Helicobacter pylori. En: American Journal Clinical Nutrition. 2004. Vol. 80, p. 737-741.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000314&pid=S1794-4449201200020001700103&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>104. HOOLIHAN, L.; <i>et al</i>. Op. Cit.,p.229-241.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000316&pid=S1794-4449201200020001700104&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>105. TARANTO, M.; M&Eacute;DECI, M. &amp; FONT, G. Alimentos funcionales probi&oacute;ticos. En: Revista Qu&iacute;mica Viva. 2005. Vol. 1. pp. 26-34.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000318&pid=S1794-4449201200020001700105&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>106. 106. MENNICKENT, S. y GREEN, K.; Op. Cit., p. 31-38&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000320&pid=S1794-4449201200020001700106&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>107. 107. ADOLFSSON, O.; MEYDANI, S. &amp; RUS-SELL, R.; Op. Cit., p. 245-256.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000321&pid=S1794-4449201200020001700107&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
<body><![CDATA[<!-- ref --><p>108. 108. Ib&iacute;d., p.245-256.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000323&pid=S1794-4449201200020001700108&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>109. 109. WUNGRATH, J.; <i>et al</i>. Op.Cit.,p. 5-9.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000325&pid=S1794-4449201200020001700109&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>110. 110. MENNICKENT, S. y GREEN, K. Op. Cit., p. 31-38&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000327&pid=S1794-4449201200020001700110&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>111.   MIKI, K; <i>et al</i>. Op. Cit., p. 2630-2640.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000328&pid=S1794-4449201200020001700111&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>112. HOOLIHAN, L.;<i>et al</i>. Op. Cit.,p.229-241.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000330&pid=S1794-4449201200020001700112&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>113. SHEU, B.; <i>et al</i>. Pretreatment with <i>Lactobacillus</i>- and <i>Bifdobacterium</i>-containing yogur can improve the efficacy of quadruple therapy in eradicating residual <i>Helicobacter pylori </i>infection after failed triple therapy. 2006. En: American Journal Clinical Nutrition. Vol. 83, p. 864-869.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000332&pid=S1794-4449201200020001700113&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>114. MENNICKENT, S. y GREEN, K.; Op. Cit., p. 31-38&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000334&pid=S1794-4449201200020001700114&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>115. WANG, K.; <i>et al</i>. Op. Cit., p. 737-741.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000335&pid=S1794-4449201200020001700115&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>116. ARANTO, M.; MEDECI &amp; FONT, G.; Op. Cit., pp. 26-34.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000337&pid=S1794-4449201200020001700116&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>117. Ibid., p. 26-34.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000339&pid=S1794-4449201200020001700117&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>118. PARVEZ, S., <i>et al</i>. Review Probiotics and their fermented food products are beneficial-for health. En: Journal of Applied Microbiology. 2006. Vol. 100, p. 1171-1185.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000341&pid=S1794-4449201200020001700118&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
<body><![CDATA[<!-- ref --><p>119. Ibid., p.1171-1185.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000343&pid=S1794-4449201200020001700119&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>120. AJMAL, S. &amp; AHMED, N. Op.Cit., p. 851-855&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000345&pid=S1794-4449201200020001700120&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>121. LEE, J.; <i>et al</i>. Genetic and Proteomic Analysis of Factors Affecting Serum Cholesterol Reduction by <i>Lactobacillus &aacute;cidophilus</i>. En: Applied and Environmental Microbiology. 2010. 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<body><![CDATA[<!-- ref --><p>150. MENNICKENT, S. y GREEN, K.; Op. Cit., p. 31-38&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000403&pid=S1794-4449201200020001700150&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>151. NIBA, L. Minireview The relevance of biotechnology in the development of functional foods for improved nutritional and health quality in developing countries. En: African Journal of Biotechnology. 2003. Vol. 2, p. 631-635.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000404&pid=S1794-4449201200020001700151&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>152. ADOLFSSON, O.; MEYDANI, S. &amp; RUSSELL, R.; Op. Cit., p. 245-256.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000406&pid=S1794-4449201200020001700152&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>153. MART&Iacute;NEZ, M.; PACHO, S.; VICARIO, S.; Op. Cit., p. 573-583.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000408&pid=S1794-4449201200020001700153&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>154. LARSSON, S.; <i>et al</i>. Cultured milk, yogur, and dairy intake in relation to bladder cancer risk in a prospective study of Swedish women and men. En: American Journal Clinical Nutrition. 2008. 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Vol. 90,p. 1920-1928.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000418&pid=S1794-4449201200020001700158&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>159. ADOLFSSON, O.; MEYDANI, S. &amp; RUSSELL, R.; Op. Cit., p. 245-256.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000420&pid=S1794-4449201200020001700159&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>160. AJMAL, S. &amp; AHMED, N.; Op.Cit.,p.851-855.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000422&pid=S1794-4449201200020001700160&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p>161. MENNICKENT, S. &amp; GREEN, K.; Op. Cit., p. 31-38&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000424&pid=S1794-4449201200020001700161&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>162. LOURENS, A. &amp;VILJOEN, B.;Op. 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