<?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>0121-0319</journal-id>
<journal-title><![CDATA[Medicas UIS]]></journal-title>
<abbrev-journal-title><![CDATA[Medicas UIS]]></abbrev-journal-title>
<issn>0121-0319</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-03192013000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Factores, causas y perspectivas de la obesidad infantil en México]]></article-title>
<article-title xml:lang="en"><![CDATA[Factors, causes and perspective of childhood obesity in Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acosta-Hernández]]></surname>
<given-names><![CDATA[Mario E]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gasca-Pérez]]></surname>
<given-names><![CDATA[Eloy]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Morales]]></surname>
<given-names><![CDATA[Fernando R]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García -Rodríguez]]></surname>
<given-names><![CDATA[Rosa V]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís-Páez]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Evaristo-Portilla]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soto-Cid]]></surname>
<given-names><![CDATA[Abraham H]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Veracruzana  ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Veracruzana  ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Veracruzana Facultad de Bioanálisis Campus Xalapa ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Veracruzana Facultad de Bioanálisis Campus Xalapa ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>México</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Universidad Veracruzana Facultad de Química Farmacéutica Biológica ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2013</year>
</pub-date>
<volume>26</volume>
<numero>1</numero>
<fpage>59</fpage>
<lpage>68</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-03192013000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-03192013000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-03192013000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Este escrito comprende una revisión bibliográfica sobre la obesidad infantil en México desde el año 2000 a 2012. La obesidad constituye un problema de salud pública la cual recientemente ha alcanzado proporciones de epidemia en algunos países. Esta patología constituye el principal problema de malnutrición en el adulto y es una enfermedad que ha aumentado notoriamente en la población infantil, ya que se calcula que más de 40 millones de niños padecen sobrepeso u obesidad. Es un trastorno multifactorial en cuya etiopatogenia están implicados factores genéticos, metabólicos, psicosociales y ambientales, por lo que es difícil distinguir en cada caso en particular la importancia relativa de estos factores. La obesidad infantil es uno de los factores de riesgo vinculados al aumento de enfermedad cardiovascular en el adulto, junto con la hipertensión, hipercolesterolemia y diabetes tipo II; se ha identificado que un factor importante en el desarrollo de la obesidad infantil es la influencia de los medios electrónicos que promueven un estilo de vida básicamente sedentario. (MÉD.UIS. 2013;26(1)59:68).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[This work is a review of the information about childhood obesity in Mexico from 2000 to 2012. Obesity is a public health problem, which has recently reached epidemic proportions in some countries. This pathology is the main problem of adult malnutrition and has dramatically increased in children, since it is estimated that over 40 million children have overweight or obesity. It involves several factors such as genetic, metabolic, psychosocial and environmental ones. As a result, it is difficult to distinguish their influence in different cases. However, a well-recognized factor in the development of childhood obesity is the media, which promotes a sedentary lifestyle. Childhood obesity is a risk factor associated with cardiovascular disease in adults, hypertension, hypercholesterolemia and diabetes Type II. (MÉD. UIS. 2013;26(1)59:68).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Obesidad]]></kwd>
<kwd lng="es"><![CDATA[Pediatría]]></kwd>
<kwd lng="es"><![CDATA[Sobrepeso]]></kwd>
<kwd lng="es"><![CDATA[Diabetes Mellitus]]></kwd>
<kwd lng="en"><![CDATA[Obesity]]></kwd>
<kwd lng="en"><![CDATA[Pediatrics]]></kwd>
<kwd lng="en"><![CDATA[Overweight]]></kwd>
<kwd lng="en"><![CDATA[Diabetes Mellitus]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font size="2" face="Verdana">     <p align="center"><font size="4"><b>Factores, causas y perspectivas de la obesidad    <br> infantil en M&eacute;xico</b></font></p>      <p align="right"><i>Mario E. Acosta-Hern&aacute;ndez*    <br> Eloy Gasca-P&eacute;rez*    <br> Fernando R. Ramos-Morales**    <br> Rosa V. Garc&iacute;a -Rodr&iacute;guez**    <br> Francisco Sol&iacute;s-P&aacute;ez***    <br> Gabriela Evaristo-Portilla****    <br> Abraham H. Soto-Cid *****</i></p>	      ]]></body>
<body><![CDATA[<p align="justify">*Maestro en Ciencias. Unidad de Servicios de Apoyo en Resoluci&oacute;n Anal&iacute;tica de la Universidad Veracruzana. Calle Luis Castelazo Ayala S/N, Col. Industrial Animas, 91020, Xalapa. Veracruz. M&eacute;xico.    <br> **Doctor en Ciencias. Unidad de Servicios de Apoyo en Resoluci&oacute;n Anal&iacute;tica de la Universidad Veracruzana. Calle Luis Castelazo Ayala S/N, Col. Industrial Animas, 91020, Xalapa. Veracruz. M&eacute;xico.    <br> ***Licenciado en Quimica Clinica. Facultad de Bioan&aacute;lisis Campus Xalapa. Universidad Veracruzana. M&eacute;dicos y Odont&oacute;logos s/n Unidad del Bosque, 91010, Xalapa. Veracruz. M&eacute;xico.    <br> ****Estudiante de Licenciatura en Qu&iacute;mica Cl&iacute;nica. Facultad de Bioan&aacute;lisis Campus Xalapa. Universidad Veracruzana. M&eacute;dicos y Odont&oacute;logos s/n Unidad del Bosque, 91010, Xalapa. Veracruz. M&eacute;xico.    <br> *****Doctor en Ciencias. Facultad de Qu&iacute;mica Farmac&eacute;utica Biol&oacute;gica. Universidad Veracruzana. Zona Universitaria, 91190, Xalapa. Veracruz. M&eacute;xico.    <br> Correspondencia: Dr. Fernando R. Ramos Morales.Unidad de Servicios de Apoyo en Resoluci&oacute;n Anal&iacute;tica de la Universidad Veracruzana. Calle Luis Castelazo Ayala S/N, Col. Industrial Animas, 91020, Xalapa. Veracruz M&eacute;xico. Correo electr&oacute;nico: <a href="mailto:framos@uv.mx">framos@uv.mx</a>.    <br> Art&iacute;culo recibido 18 de enero de 2013 y aceptado para publicaci&oacute;n el 1 de marzo de 2013</p>  <hr>     <p align="left"><font size="3"><b>RESUMEN</b></font></p>     <p align="justify">Este escrito comprende una revisi&oacute;n bibliogr&aacute;fica sobre la obesidad infantil en M&eacute;xico desde el a&ntilde;o 2000 a 2012. La obesidad constituye un problema de salud p&uacute;blica la cual recientemente ha alcanzado proporciones de epidemia en algunos pa&iacute;ses. Esta patolog&iacute;a constituye el principal problema de malnutrici&oacute;n en el adulto y es una enfermedad que ha aumentado notoriamente en la poblaci&oacute;n infantil, ya que se calcula que m&aacute;s de 40 millones de ni&ntilde;os padecen sobrepeso u obesidad. Es un trastorno multifactorial en cuya etiopatogenia est&aacute;n implicados factores gen&eacute;ticos, metab&oacute;licos, psicosociales y ambientales, por lo que es dif&iacute;cil distinguir en cada caso en particular la importancia relativa de estos factores. La obesidad infantil es uno de los factores de riesgo vinculados al aumento de enfermedad cardiovascular en el adulto, junto con la hipertensi&oacute;n, hipercolesterolemia y diabetes tipo II; se ha identificado que un factor importante en el desarrollo de la obesidad infantil es la influencia de los medios electr&oacute;nicos que promueven un estilo de vida b&aacute;sicamente sedentario. (M&Eacute;D.UIS. 2013;26(1)59:68).</p> 	     <p align="left"><b>Palabras Clave:</b> Obesidad. Pediatr&iacute;a. Sobrepeso. Diabetes Mellitus.</p>      ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b>Factors, causes and perspective of childhood obesity in Mexico</b></font></p>	     <p align="left"><font size="3"><b>ABSTRACT</b></font></p>     <p align="justify">This work is a review of the information about childhood obesity in Mexico from 2000 to 2012. Obesity is a public health problem, which has recently reached epidemic proportions in some countries. This pathology is the main problem of adult malnutrition and has dramatically increased in children, since it is estimated that over 40 million children have overweight or obesity. It involves several factors such as genetic, metabolic, psychosocial and environmental ones. As a result, it is difficult to distinguish their influence in different cases. However, a well-recognized factor in the development of childhood obesity is the media, which promotes a sedentary lifestyle. Childhood obesity is a risk factor associated with cardiovascular disease in adults, hypertension, hypercholesterolemia and diabetes Type II. (M&Eacute;D. UIS. 2013;26(1)59:68).</p> 	     <p align="left"><b>Keywords:</b> Obesity. Pediatrics. Overweight. Diabetes Mellitus.</p> <hr>     <p align="center"><font size="3"><b><u>INTRODUCCI&Oacute;N</u></b></font></p>      <p align="justify">En la actualidad los t&eacute;rminos de sobrepeso y obesidad se emplean como sin&oacute;nimos, sin embargo, el sobrepeso se refiere a un exceso de peso corporal comparado con la talla, mientras que la obesidad se refiere a un exceso de grasa corporal. La obesidad puede definirse como aquella condici&oacute;n caracterizada por la acumulaci&oacute;n excesiva de grasa corporal, como consecuencia de un ingreso cal&oacute;rico superior al gasto energ&eacute;tico diario del individuo<sup>1,2</sup>. Actualmente es la pandemia no transmisible mayormente distribuida del mundo<sup>3</sup>.</p>      <p align="justify">Sin embargo, se ha definido a la obesidad como una enfermedad cr&oacute;nica, compleja y multifactorial que suele iniciarse en la infancia &oacute; la adolescencia teniendo su origen en una interacci&oacute;n gen&eacute;tica y ambiental, siendo m&aacute;s importante la parte ambiental o conductual, que se establece por un desequilibrio entre la ingesta y el gasto energ&eacute;tico diario. Esta enfermedad se caracteriza por una excesiva acumulaci&oacute;n de grasa y se manifiesta por un exceso de peso y vol&uacute;men corporal<sup>4</sup>.</p>      <p align="justify">De acuerdo con la OMS el Indice de Masa Corporal (IMC) definido como el peso en kilogramos de un sujeto, dividido por el cuadrado de la altura en metros (Kg/m<sup>2</sup>), es empleado para evaluar el sobre peso y la obesidad de un individuo, si un IMC est&aacute; por arriba de 25 Kg/m<sup>2</sup> es interpretado como sobrepeso y por encima de 30 Kg/m<sup>2</sup> se cataloga como obesidad<sup>2,4-8</sup>. El objetivo de esta revisi&oacute;n es mostrar un panorama de la obesidad infantil en M&eacute;xico, haciendo una revisi&oacute;n bibliogr&aacute;fica desde el a&ntilde;o 2000 a 2012, considerando datos epidemiol&oacute;gicos de ni&ntilde;os menores de 5 a&ntilde;os y en edad escolar, de 5 a 11 a&ntilde;os.</p>      <p align="center"><font size="3"><b><u>EPIDEMIOLOG&Iacute;A</u></b></font></p>      <p align="justify">De acuerdo con la OMS, actualmente existen en el mundo m&aacute;s de 1000 millones de adultos con problemas de sobrepeso y al menos 300 millones son cl&iacute;nicamente obesos. Estos &iacute;ndices no son propios s&oacute;lo de pa&iacute;ses desarrollados, como inicialmente se lleg&oacute; a pensar, sino que tambi&eacute;n afecta a pa&iacute;ses con menor desarrollo socioecon&oacute;mico<sup>4</sup>. La obesidad y el sobrepeso suponen el mayor riesgo para las enfermedades cr&oacute;nicas, como: diabetes tipo II, enfermedades cardiovasculares, hipertensi&oacute;n y ciertas formas de c&aacute;ncer<sup>9</sup>. De acuerdo a las estad&iacute;sticas, cada a&ntilde;o mueren alrededor de 2,6 millones de personas a causa de enfermedades relacionadas directamente con la obesidad. El 65&#37; de la poblaci&oacute;n mundial vive en pa&iacute;ses donde el sobrepeso y la obesidad causan m&aacute;s muertes que la desnutrici&oacute;n. As&iacute; mismo causa el 44&#37; de los casos mundiales de diabetes, el 23&#37; de cardiopat&iacute;as y el 7&#37; de algunos c&aacute;nceres son atribuidos al exceso de peso<sup>9</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">En M&eacute;xico, la evoluci&oacute;n hist&oacute;rica de este fen&oacute;meno ha estado relacionada con el mal estado nutricional de la poblaci&oacute;n. En 1946 se public&oacute; un art&iacute;culo en el que se reconoce que al conjunto de s&iacute;ndromes que originan la obesidad se le denomina malnutrici&oacute;n<sup>4</sup>. La Encuesta Nacional de Salud y Nutrici&oacute;n 2012 indica que este padecimiento va en aumento, ya que en el pa&iacute;s, 26 millones de adultos mexicanos presentaban sobrepeso y 22 millones, obesidad.En constraste, a nivel mundial en 2008, 1400 millones de adultos de m&aacute;s de 20 a&ntilde;os ten&iacute;an sobrepeso, de los cuales, m&aacute;s de 200 millones de hombres y cerca de 300 millones de mujeres eran obesos, mientras que en 2010, alrededor de 40 millones de ni&ntilde;os menores de cinco a&ntilde;os ten&iacute;an sobrepeso<sup>10</sup>.</p>      <p align="justify">Particularmente en M&eacute;xico, la Encuesta Nacional de Salud y Nutrici&oacute;n menciona una prevalencia de sobrepeso m&aacute;s obesidad en ni&ntilde;os menores de cinco a&ntilde;os del 9,7 &#37; en 2012, 1,4 puntos porcentuales m&aacute;s con respecto a la encuesta anterior realizada en el a&ntilde;o 2006, donde el valor alcanzaba 8,3 &#37;. Por otra parte, en el grupo de infantes en edad escolar, que comprende de 5 a 11 a&ntilde;os, se observa que la prevalencia combinada de sobrepeso y obesidad fue de 34,4 &#37; en ambos sexos, 1,1 &#37; menos que en 2006<sup>3</sup>. Estos datos al ser comparados con el resto del mundo, se encuentra entre las m&aacute;s elevadas del orbe<sup>4,11</sup>. En constraste, a nivel mundial en 2010, alrededor de 40 millones de ni&ntilde;os menores de 5 a&ntilde;os ten&iacute;an sobrepeso, lo que se traduce como un problema de gran importancia en Salud P&uacute;blica12; que se asocia con diversas enfermedades, problemas f&iacute;sicos y consecuencias psicol&oacute;gicas<sup>13,14</sup>.</p>      <p align="justify">En Estados Unidos, desde 1980 se ha duplicado el n&uacute;mero de ni&ntilde;os con sobrepeso, mientras que el n&uacute;mero de adolescentes con esta entidad se triplic&oacute;. Actualmente, este problema se ha convertido en una pandemia, M&eacute;xico se encuentra entre los pa&iacute;ses con m&aacute;s alta prevalencia de sobrepeso en ni&ntilde;os<sup>1</sup>. Se estima que en el pa&iacute;s entre un 10 y 20&#37; de estos padecimientos se dan en la infancia, de 30 a 40&#37; en la adolescencia y hasta de un 60 a 70&#37; en los adultos. Las estad&iacute;sticas han indicado que en los &uacute;ltimos diez a&ntilde;os una tercera parte de la poblaci&oacute;n entre 5 y 11 a&ntilde;os de edad en el pa&iacute;s presenta exceso de peso corporal (sobrepeso m&aacute;s obesidad) y esto persiste como un gran reto de salud; ni&ntilde;os varones presentan una prevalencia de obesidad del 36,9&#37;, mientras que en las ni&ntilde;as se muestra en un 32&#37;<sup>15</sup> (Ver <a href="#g01">Gr&aacute;fica 1</a>.) Gr&aacute;fica 1. Prevalencia de sobrepeso m&aacute;s obesidad infantil en M&eacute;xic</p>      <p align="center"><a name="g01"></a><img src="img/revistas/muis/v26n1/v26n01a07g1.jpg"></p>      <p align="justify">Una tendencia importante de la biolog&iacute;a del ser humano es el incremento del tama&ntilde;o, conforme los ni&ntilde;os van creciendo de igual manera van ganando peso<sup>16,17</sup>. A los cuatro meses de edad se tiene gran cantidad de grasa, que disminuye de forma constante entre los 2 y 6 a&ntilde;os. Sin embargo, si un ni&ntilde;o es obeso entre los seis meses y siete a&ntilde;os de edad, la probabilidad de que siga siendo obeso en la edad adulta es del 40&#37;. Si un ni&ntilde;o es obeso entre los 10 y 13 a&ntilde;os, las probabilidades aumentan a un 70&#37;. Esto se explica porque los adipocitos, se multiplican en esta etapa de la vida, por lo cual aumenta la posibilidad del ni&ntilde;o de ser obeso cuando sea adulto<sup>18-20</sup>. Seg&uacute;n consenso, la etiolog&iacute;a de la obesidad se relaciona con la occidentalizaci&oacute;n en los h&aacute;bitos alimentarios y el sedentarismo<sup>21,22</sup>. La obesidad infantil es epid&eacute;mica en pa&iacute;ses como Grecia, Estados Unidos, M&eacute;xico, Italia y Nueva Zelanda y est&aacute; en aumento en otros; se estima que globalmente, 22 millones de ni&ntilde;os menores de cinco a&ntilde;os presentan sobrepeso. La prevalencia de obesidad infantil est&aacute; aumentando de manera alarmante tanto en pa&iacute;ses desarrollados como en aquellos en v&iacute;as de desarrollo<sup>9,23</sup>.</p>      <p align="center"><font size="3"><b>ETIOLOG&Iacute;A DE LA OBESIDAD INFATIL</b></font>     <p align="justify">Como se mencion&oacute; anteriormente el sobrepeso y la obesidad no tienen una causa &uacute;nica, son dependientes de diversos factores que promuevan la sobre ingesta de alimento a nivel de sistema nervioso central pero tambi&eacute;n el almacenaje excesivo de ciertos componentes como el tejido adiposo, que son relacionados con anomal&iacute;as perif&eacute;ricas asociadas tanto a variaciones en receptores espec&iacute;ficos hasta la secreci&oacute;n de sustancias por dicho tejido<sup>24-26</sup>.</p>      <p align="justify">Uno de los factores adquiridos que tienen mayor importancia son el lugar de nacimiento y residencia de la poblaci&oacute;n, ya que es conocido que la prevalencia de esta enfermedad es mayor en pa&iacute;ses occidentales, y esto est&aacute; &iacute;ntimamente ligado a los h&aacute;bitos alimenticios propios de cada pa&iacute;s. Estudios comparativos en mexicoamericanos mencionan que aquellos nacidos en EEUU tienen hasta un 65&#37; de riesgo de desarrollar obesidad en comparaci&oacute;n con los nacidos en M&eacute;xico<sup>27</sup>. Aunado a esto, existen factores ambientales que var&iacute;an de pa&iacute;s a pa&iacute;s, dependiendo el nivel de industrializaci&oacute;n e incluso dentro de un mismo pa&iacute;s, el ambiente urbanizado tiende a tener mayores implicaciones en el desarrollo de este padecimiento en comparaci&oacute;n con el medio rural, debido a mayores niveles de estr&eacute;s<sup>28,29</sup>.</p>      <p align="justify">Por otra parte, las dietas actuales son ricas en alto contenido de grasas, carbohidratos y bajas en fibra, esto asociado con el alto nivel de sedentarismo, que predispone a la poblaci&oacute;n a desarrollar dicha patolog&iacute;a<sup>30,31</sup>. El crecimiento econ&oacute;mico, la modernizaci&oacute;n, la urbanizaci&oacute;n y la globalizaci&oacute;n de los mercados alimentarios son algunas de las fuerzas que subyacen en esta epidemia mundial<sup>8,19</sup>. Actualmente los ni&ntilde;os y adolescentes sustituyen actividades f&iacute;sicas por pautas como ver la televisi&oacute;n, jugar videojuegos, visitar redes sociales en medios electr&oacute;nicos, por dar algunos ejemplos<sup>32,33</sup>. La alta ingesta de calor&iacute;as en comparaci&oacute;n con la energ&iacute;a gastada en ni&ntilde;os y adolescentes con conducta sedentaria, explica porque estos factores antes mencionados no son mutuamente excluyentes<sup>34</sup>.</p>      <p align="justify">Adem&aacute;s de los factores ambientales, se encuentran los factores hereditarios, hormonales, metab&oacute;licos y psicosociales<sup>7,35</sup>. Los factores gen&eacute;ticos rigen la capacidad o facilidad de acumular energ&iacute;a en forma de grasa tisular y menor facilidad para liberarla en forma de calor, lo que se denomina como elevada eficiencia energ&eacute;tica del obeso. Se produce porque a largo plazo el gasto energ&eacute;tico que presenta el individuo es inferior que la energ&iacute;a que ingiere, es decir, existe un balance energ&eacute;tico positivo. La influencia gen&eacute;tica se va a asociar a condiciones externas como los h&aacute;bitos diet&eacute;ticos y estilos de vida, relacionado esto con la disponibilidad de alimentos, la estructura sociol&oacute;gica y cultural que intervienen en el mecanismo de regulaci&oacute;n del gasto y almacenamiento de la energ&iacute;a que es lo que define la estructura f&iacute;sica<sup>35,36</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">Dentro de las teor&iacute;as relacionadas con el desarrollo de la enfermedad se encuentran las siguientes:</p>      <p align="left"><font size="3"><B>Hip&oacute;tesis del gen ahorrador</B></font></p>      <p align="justify">Una de las hip&oacute;tesis que existen es la propuesta por Neel, en la cual un &quot;gen ahorrador&quot; modifica la liberaci&oacute;n de insulina y el almacenamiento de glucosa<sup>37</sup>. El autor de dicha hip&oacute;tesis pretend&iacute;a explicar la epidemiolog&iacute;a de la diabetes mediante la exposici&oacute;n de casos cl&iacute;nicos de ni&ntilde;os y adultos, relacion&aacute;ndola con la historia de la evoluci&oacute;n, llegando a la conclusi&oacute;n de que este gen permit&iacute;a una utilizaci&oacute;n eficiente de los alimentos, lo que prove&iacute;a una ventaja de supervivencia, generando un almacenaje eficiente del exceso de energ&iacute;a y sobrevivir a per&iacute;odos de escasez de alimentos<sup>38</sup>. Como se ha venido mencionando, dada la occidentalizaci&oacute;n del modo de vida, los alimentos consumidos actualmente son abundantes en carbohidratos, ocasionando que personas con dicho gen sean propensas a padecer diabetes y obesidad<sup>39</sup>.</p>      <p align="left"><font size="3"><b>Genes asociados a la leptina</b></font></p>      <p align="justify">La leptina es una hormona secretada por los adipocitos, esta es transportada por la circulaci&oacute;n hasta el sistema nervioso central, donde se une a los receptoresde leptina en el n&uacute;cleo arqueado del hipot&aacute;lamo, estimulando la producci&oacute;n de proopiomelanocortina (POMC). Los dos subproductos de la POMC son la hormona a-melanocito estimulante y adrenocorticotropina. La hormona a-melanocito estimulante se une a receptores de 4-melanocortina en el n&uacute;cleo paraventricular del hipot&aacute;lamo causando una disminuci&oacute;n en la ingesta de alimentos. Anteriormente se pensaba que la deficiencia de leptina era causa de obesidad, pero ahora sabemos que la obesidad suele tener altos niveles de leptina y que la resistencia a la leptina es la causa m&aacute;s probable de obesidad. Se ha observado que un individuo gen&eacute;ticamente delgado puede ganar entre 7 y 8 kilogramos antes de que los niveles de leptina aumenten lo suficiente para detener el aumento de peso. Al parecer las personas que ganan m&aacute;s peso pudieran no responder a la hormona, ya sea por una deficiencia en la s&iacute;ntesis o por alguno mutaci&oacute;n en alguno de los muchos mecanismos de acci&oacute;n de la leptina<sup>40</sup>. Las mutaciones de este sistema leptina, receptor de leptina, POMC, o el receptor de la hormona estimuladora de los alfa melanocitos pudieran estar involucrados en el desarrollo de la obesidad<sup>41-44</sup>.</p>      <p align="justify"><font size="3"><b>Gen del receptor &szlig;-3-adren&eacute;rgico</b></font></p>      <p align="justify">Este se expresa en tejido adiposo, est&aacute; relacionado con el metabolismo de l&iacute;pidos y la termog&eacute;nesis. Una mutaci&oacute;n en el Trp64Arg se ha asociado con la obesidad<sup>45-8</sup>. La interacci&oacute;n de este receptor con otros receptores pudiera afectar la capacidad de &eacute;ste para acoplarse con sus mediadores como por ejemplo con las prote&iacute;nas G.</p>      <p align="justify"><font size="3"><b>Gen receptor proliferador de peroxisomas activado gama (PPAR -&#947;)</b></font></p>      <p align="justify">La importancia de este receptor en la obesidad es apoyada por la eficacia de las tiazolidinedionas en el tratamiento de la obesidad<sup>49</sup>. Estas se unen al receptor PPAR-&#947; generando una mejor respuesta a la insulina y generando cambios importantes en el metabolismo de las grasas incluyendo una reducci&oacute;n de los &aacute;cidos grasos libres<sup>50</sup>. PPAR-&#947; es un receptor que es importante en la termog&eacute;nesis y la se&ntilde;alizaci&oacute;n de la insulina. La mutaci&oacute;n de Pro12Ala es com&uacute;n y resulta en la disminuci&oacute;n de la respuesta de los genes PPAR-&#947;, esto trae como consecuencia que los individuos con esta mutaci&oacute;n posean predisposici&oacute;n a la obesidad<sup>51</sup>.</p>      <p align="justify"><font size="3"><b>Gen de adiponectina</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify">Este p&eacute;ptido posee muchas acciones regulatorias en la homeostasis energ&eacute;tica, metabolismo de glucosa y de los l&iacute;pidos. De manera general, altos niveles de adiponectina conllevan a la p&eacute;rdida de peso. Polimorfismos a nivel de este gen se han asociado con la obesidad<sup>52</sup>.</p>      <p align="justify">Asimismo, se han identificado otros factores asociados no solo al desarrollo de obesidad, sino tambi&eacute;n con la diabetes; estos son el ambiente fetal y neonatal, diversos estudios se&ntilde;alan que si el medio ambiente intrauterino se ve perturbado es decir, una nutrici&oacute;n pobre o enriquecida compromete la salud del reci&eacute;n nacido incrementando el riesgo de intolerancia a la insulina o intolerancia a la glucosa<sup>53,54</sup>.</p>      <p align="justify">Cl&aacute;sicamente est&aacute; establecido que si ambos padres son obesos, el riesgo para la descendencia ser&aacute; de 69 a 80&#37;; cuando solo uno de los padres es obeso ser&aacute; 41 a 50&#37; y si ninguno de los dos es obeso el riesgo para la descendencia ser&aacute; solo del 9&#37;. Varios investigadores se&ntilde;alan la existencia de otros factores ambientales predisponentes a la obesidad como el destete temprano del lactante, insuficiente uso de la lactancia materna y la ablactaci&oacute;n antes del tercer mes de vida. Tambi&eacute;n se mencionan la formaci&oacute;n de malos h&aacute;bitos en la alimentaci&oacute;n como la ausencia de desayuno, ingesti&oacute;n de grandes cantidades de alimentos en las &uacute;ltimas horas del d&iacute;a, comer muy r&aacute;pido, ingesti&oacute;n de alimentos con exceso de grasas o az&uacute;cares simples<sup>35,55-57</sup>. Es por ello que en los &uacute;ltimos 20 a&ntilde;os el incremento de la prevalencia de la obesidad solo puede ser explicado por los factores ambientales al existir una epidemia de inactividad<sup>8</sup>. Kaiser Family Foundation reporta que existe una relaci&oacute;n entre la exposici&oacute;n a los medios de comunicaci&oacute;n y el desarrollo de la obesidad infantil, ya que, entre m&aacute;s tiempo se le dedique a los medios electr&oacute;nicos, m&aacute;s notorias son las posibilidades de desarrollar la enfermedad y que esta permanezca hasta la adultez<sup>58</sup>.</p>      <p align="justify">Existen ciertos factores adquiridos que pudieran originar sobrepeso en el paciente pero en raras ocasiones llegan a una obesidad. Una de estas patolog&iacute;as es el S&iacute;ndrome de Cushing, que es un desorden hormonal caracterizado por altos niveles de cortisol en sangre. En este tipo de s&iacute;ndrome la obesidad es troncal o visceral, y es de suma importancia diferenciarlo de una obesidad simple para tratarlo de manera correcta<sup>59</sup>. En el caso del hipotiroidismo, afecci&oacute;n donde existe baja o nula producci&oacute;n de la hormona tiroidea, el peso ganado por el paciente puede deberse a la retenci&oacute;n de agua, que se perder&aacute; al seguir el tratamiento hormonal correspondiente<sup>60</sup>.</p>     <p align="left"><font size="3"><b>Enzimas del eje intestino-cerebro como sistema regulador del peso corporal</b></font></p>      <p align="justify">Existen mecanismos homeost&aacute;ticos para regular el apetito y el consumo energ&eacute;tico que son regulados por v&iacute;as de se&ntilde;alizaci&oacute;n entre el tejido adiposo y el intestino con el cerebro<sup>61</sup>. El llamado eje intestinocerebro es el encargado de regular la ingesta de alimento mediante una serie de hormonas liberadas por distintas porciones del sistema gastrointestinal. Uno de ellos, el p&eacute;ptido Y-Y (por la abreviaci&oacute;n del amino&aacute;cido tirosina, PYY) que est&aacute; conformado por 36 amino&aacute;cidos y es producido principalmente por c&eacute;lulas del tracto gastrointestinal distal, llamadas c&eacute;lulas L<sup>62</sup>. Este p&eacute;ptido tiene dos isoformas, PYY1-36 y PYY3-36, de las cuales la segunda es la mayormente presente en sangre en los estados de ayuno y alimentaci&oacute;n, adem&aacute;s ha sido relacionado con el consumo de energ&iacute;a, la regulaci&oacute;n del peso corporal a largo plazo, y sensaci&oacute;n de saciedad dependiente de la carga cal&oacute;rica<sup>63-65</sup>. Estudios realizados en personas obesas demuestran que necesitan mayor ingesta cal&oacute;rica para que los niveles sangu&iacute;neos de PYY3-36 alcancen los niveles necesarios para generar la sensaci&oacute;n de saciedad en comparaci&oacute;n con personas sanas<sup>66</sup>.</p>      <p align="justify">Otro producto derivado de la secreci&oacute;n del tracto gastrointestinal es el polip&eacute;ptido pancre&aacute;tico (PP), formado por 36 amino&aacute;cidos y que es secretado en su mayor&iacute;a por c&eacute;lulas F, localizadas en la periferia de los islotes de Langerhans en el p&aacute;ncreas y en menor medida por el colon<sup>67</sup>. El est&iacute;mulo primario para la liberaci&oacute;n de esta sustancia es la ingesta de nutrientes, aunque otros factores como la estimulaci&oacute;n adren&eacute;rgica o el ejercicio en conjunto con colecistoquinina pudieran afectar la liberaci&oacute;n de PP. El PP tiene funciones fisiol&oacute;gicas como la inhibici&oacute;n del vaciado g&aacute;strico, movilidad de la ves&iacute;cula y secreci&oacute;n exocrina pancre&aacute;tica<sup>68</sup>. Estudios de administraci&oacute;n por distintas v&iacute;as del PP realizados tanto en roedores como en humanos demuestran que en individuos sanos se presenta una disminuci&oacute;n de la ingesta de nutrientes, y que esta inhibici&oacute;n se conserva en roedores y humanos m&oacute;rbidamente obesos<sup>69-71</sup>.</p>      <p align="justify">La amilina es un neuropeptido m&aacute;s, compuesto por 37 amino&aacute;cidos que es secretado de manera simult&aacute;nea con la insulina desde las c&eacute;lulas beta del p&aacute;ncreas en respuesta a la ingesti&oacute;n de nutrientes, incremento hormonal y est&iacute;mulo neuronal y est&aacute; relacionado a la regulaci&oacute;n de glucosa, inhibici&oacute;n de la secreci&oacute;n de glucag&oacute;n postprandial y retraso en el vaciado g&aacute;strico. Se ha demostrado que la administraci&oacute;n de amilina en roedores por distintas v&iacute;as reduce la porci&oacute;n de comida ingerida as&iacute; como alimentos altos en grasas y az&uacute;cares. Esta enzima tiende a agregarse lo que limita su acci&oacute;n anorex&iacute;gena, sin embargo, existe un an&aacute;logo sint&eacute;tico que difiere en 3 amino&aacute;cidos llamado pramlintide (AC137) que funciona como agente anti-agregaci&oacute;n, lo que mantiene la actividad de la amilina<sup>72,73</sup>. Investigaciones en sujetos con diabetes tipo 2 y obesos no diab&eacute;ticos demostr&oacute; que una inyecci&oacute;n subcut&aacute;nea de pramlintide 1 hora antes de un buffet reduce la ingesta de alimento<sup>73</sup>. La colecistoquinina (CCK) es otra enzima de tipo anorex&iacute;gena secretada por el intestino delgado y que tiene receptores a nivel de p&aacute;ncreas, ves&iacute;cula y fibras aferentes del nervio vago, adem&aacute;s de encontrarse receptores tambi&eacute;n en el n&uacute;cleo del tracto solitario, en el &aacute;rea postrema e hipot&aacute;lamo dorsomedial<sup>74,75</sup>. Esta enzima es secretada en respuesta al consumo de grasas saturadas, largas cadenas de &aacute;cidos grasos, as&iacute; como, amino&aacute;cidos y peque&ntilde;os p&eacute;ptidos. Est&aacute; involucrada a la estimulaci&oacute;n de la secreci&oacute;n de PYY y la inhibici&oacute;n de la grelina, lo que desencadena la conducta de saciedad en animales de laboratorio. Sin embargo, esta enzima est&aacute; restringida en el tratamiento de sobrepeso y obesidad debido a las n&aacute;useas y tolerancia que produce su consumo a largo plazo<sup>76-78</sup>.</p>      <p align="justify">La Oxintomodulina (OXM), es una enzima que se eleva pospandrialmente, y esta elevaci&oacute;n es directamente proporcional al consumo cal&oacute;rico. Estudios en roedores sugieren que la OXM est&aacute; relacionada a la reducci&oacute;n de la ingesta de comida de manera aguda y en pruebas a largo plazo, los roedores sometidos a tratamiento con dicha enzima presentaron p&eacute;rdida de peso significativa con respecto a los controles<sup>79,80</sup>. En humanos obesos, los estudios realizados demuestran que la administraci&oacute;n de OXM reduce tanto la ingesta de alimento como el peso corporal<sup>81,82</sup>. Por &uacute;ltimo, existe una enzima que al contrario de las presentadas anteriormente se le atribuye una funci&oacute;n orex&iacute;gena, es decir, que al secretarse eleva el consumo de alimento generando ganancia de peso corporal, denominada grelina. En sujetos sanos, se han detectado altos niveles de grelina en estados de vigilia, sin embargo, en personas con anorexia nerviosa, reducci&oacute;n de la dieta o cirug&iacute;a bari&aacute;trica tambi&eacute;n se presenta elevaci&oacute;n de esta enzima<sup>83,84</sup>. La grelina est&aacute; relacionada con la obesidad ya que funciona como regulador de otras enzimas orex&iacute;genas como el neurop&eacute;ptido Y, lo que sugiere que una descompensaci&oacute;n en la producci&oacute;n de grelina o en los receptores ubicados en el n&uacute;cleo arcuato del hipot&aacute;lamo podr&iacute;a predisponer una ganancia de peso<sup>85-88</sup>.</p>      <p align="justify">Todas las enzimas descritas, tienen como fin com&uacute;n la homeostasis del eje intestino cerebro, regulando la ingesta de alimento de manera directa y de manera indirecta, la reducci&oacute;n o ganancia del peso corporal, el gasto energ&eacute;tico y la digesti&oacute;n de las distintas macromol&eacute;culas provenientes de los alimentos, lo que sugiere que cambios en la s&iacute;ntesis de estas enzimas y la expresi&oacute;n de sus respectivos receptores a nivel de sistema nervioso central predisponen a los individuos a padecer sobrepeso u obesidad<sup>89</sup>.</p>      ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b>Consecuencias de la obesidad infantil</b></font></p>      <p align="justify">La obesidad est&aacute; asociada con significativos problemas de salud en la infancia, es un importante y temprano factor de riesgo en gran parte de la morbilidad y mortalidad del adulto. Los problemas m&eacute;dicos comunes en ni&ntilde;os y adolescentes obesos pueden afectar la salud cardiovascular produciendo hipercolesterolemia, diabetes tipo, dislipidemia e hipertensi&oacute;n, provocando adem&aacute;s a nivel psicol&oacute;gico depresi&oacute;n y baja autoestima<sup>90-2</sup>.</p>      <p align="center"><font size="3"><b><u>DIAGN&Oacute;STICO</u></b></font></p>      <p align="justify">El m&eacute;todo diagn&oacute;stico utilizado se basa en est&aacute;ndares internacionales de IMC para edad, calculado como peso (Kg) dividido por la talla al cuadrado (m<sup>2</sup>)<sup>93,94</sup>. Estos est&aacute;ndares se han desarrollado para ni&ntilde;os y adolescentes y corresponden con la clasificaci&oacute;n de sobrepeso y obesidad para adultos de la OMS donde el punto de corte para sobrepeso es de 25 de IMC y el de obesidad es de 30. Con esta premisa un subgrupo de expertos de la OMS desarroll&oacute; est&aacute;ndares de IMC para la poblaci&oacute;n pedi&aacute;trica basados en los mismos puntos de corte. Posteriormente, &eacute;stos se trasladaron a su equivalente para cada edad, con el beneficio adicional de ser utilizables a nivel mundial<sup>19,93</sup>. De acuerdo con el Centro de Control y Prevenci&oacute;n de Enfermedades (CDC, por sus siglas en ingl&eacute;s) en el caso espec&iacute;fico de infantes, el m&eacute;dico debe calcular el IMC y posteriormente compararlo con las tablas estandarizadas de crecimiento, permitiendo un c&aacute;lculo del percentil, es decir, c&oacute;mo se compara un ni&ntilde;o con otros de la misma edad y sexo. As&iacute;, por ejemplo, es posible que le digan que dicho ni&ntilde;o est&aacute; en el percentil 80. Esto significa que en comparaci&oacute;n con otros ni&ntilde;os de la misma edad y sexo, el 80&#37; tienen un IMC m&aacute;s bajo. As&iacute; pues, los puntos de corte establecidos por la OMS y el CDC son: IMC para la edad entre los percentiles 85 y 94 corresponden a sobrepeso, mientras que un IMC para la edad correspondiente en el percentil 95 o superior es considerado obesidad<sup>95</sup>.</p>      <p align="center"><font size="3"><b><u>TRATAMIENTO</u></b></font></p>      <p align="justify">La terapia nutricional juega un papel importante en la prevenci&oacute;n y el tratamiento de la enfermedad<sup>96</sup>. Es una terapia ciertamente compleja en la cual deben intervenir pediatras, nutricionistas, dietistas, psic&oacute;logos, comunicadores sociales y profesionales que trabajen para modifi car los factores de alimentaci&oacute;n y estilos de vida u otros factores causales<sup>93,97</sup>. Cabe mencionar que en el tratamiento nutricional se deben satisfacer las necesidades de nutrientes para garantizar el correcto crecimiento y desarrollo del ni&ntilde;o, por lo cual no se deben usar dietas restrictivas<sup>93,98</sup>. Adem&aacute;s de la dieta es necesario un plan de ejercicios que permitan al ni&ntilde;o la p&eacute;rdida de grasa y mantener un adecuado seguimiento m&eacute;dico<sup>19</sup>.</p>      <p align="justify">A nivel farmacol&oacute;gico, el rimonabant y la sibutramina fueron ampliamente empleados en el tratamiento de la obesidad, sin embargo, han sido retirados del mercado por sus efectos adversos. Actualmente el orlistat es el &uacute;nico medicamento recomendado para el tratamiento a largo plazo. Si bien no es tan efi caz para la reducci&oacute;n del peso corporal, es seguro en los eventos cardiovasculares y sus efectos positivos en el control de la diabetes<sup>99</sup>. Sin embargo, el orlistat solo es utilizado en adolescentes mayores de 12 a&ntilde;os, debido a que en edades inferiores un r&eacute;gimen alimentario apropiado, as&iacute; como un una rutina de actividad f&iacute;sica es considerada sufi ciente para prevenir o tratar la obesidad infantil. Aunado a esto, se sabe que el orlistat produce efectos adversos de tipo gastrointestinal como sudoraci&oacute;n oleosa, aumento en la defecaci&oacute;n, defecaci&oacute;n oleosa, heces blandas e incontinencia fecal. Dichos efectos est&aacute;n directamente relacionados con el consumo de grasas en la dieta, es decir, que a menor consumo de grasas en la dieta, la sintomatolog&iacute;a disminuir&aacute; considerablemente (Ver <a href="#f01">Figura 1</a>)<sup>100</sup>.</p>     <p align="center"><a name="f01"></a><img src="img/revistas/muis/v26n1/v26n01a07f1.jpg"></p>       <p align="justify">A nivel conductual ha demostrado que los ni&ntilde;os en edad preescolar son infl uenciados principalmente por el medio ambiente y las experiencias, lo cual se ve refl ejado en los h&aacute;bitos y sus preferencias alimentarias. Algunos estudios sugieren la restricci&oacute;n moderada de los alimentos no sanos en lugar de que el ni&ntilde;o sea presionado para consumir ciertos alimentos, de igual manera se puede recompensar las buenas acciones de los ni&ntilde;os con alimentos saludables increment&aacute;ndose la raci&oacute;n, especialmente en las horas de comida, lo cual favorecer&iacute;a la respuesta de los ni&ntilde;os a una buena pr&aacute;ctica en su alimentaci&oacute;n<sup>101,102</sup>.</p>      <p align="justify">Cuando los m&eacute;todos tradicionales como la dieta y el ejercicio fallan, la siguiente opci&oacute;n es la cirug&iacute;a bari&aacute;trica, la cual se ha convertido en el m&eacute;todo m&aacute;s empleado para el tratamiento de la obesidad en adolescentes mayores de 12 a&ntilde;os y adultos, cuyo IMC es superior a 35 Kg/m<sup>2</sup> dado que ha sido la &uacute;nica manera de perder peso de forma permanente<sup>103-105</sup>. En pacientes menores de 12 a&ntilde;os, de la misma forma que en el tratamiento farmacol&oacute;gico, se sabe que un r&eacute;gimen adecuado de alimentaci&oacute;n y actividad f&iacute;sica son sufi cientes para reducir de manera considerable el IMC en condiciones de sobrepeso u obesidad. En pacientes que se han sometido a este procedimiento, y que adem&aacute;s son diab&eacute;ticos tipo II, alrededor del 87&#37; han mostrado mejor&iacute;a en la enfermedad, debido a que la cirug&iacute;a puede reducir el n&uacute;mero de calor&iacute;as absorbidas<sup>105</sup>. Sin embargo, este procedimiento posee algunas desventajas, los pacientes requieren supervisi&oacute;n m&eacute;dica constante durante un periodo indeterminado adem&aacute;s de estudios de laboratorio en este tiempo, los m&eacute;dicos tratantes deben estar familiarizados con los cuidados postoperatorios, porque podr&iacute;a derivar en una defi ciencia de nutrientes<sup>105</sup>, adem&aacute;s en algunas ocasiones es necesario la readmisi&oacute;n de los pacientes corriendo el riesgo de realizar intervenciones secundarias<sup>103,106</sup>.</p>      ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b><u>CONCLUSIONES</u></b></font></p>      <P align="justify">La obesidad es m&aacute;s que una cuesti&oacute;n est&eacute;tica, es una enfermedad que puede llegar a complicarse, siendo el factor principal para desarrollar diabetes tipo II en el pa&iacute;s. Se debe hacer una mejor difusi&oacute;n de la necesidad de una dieta sana y una conciencia social sobre la conducta sedentaria y estimular tanto en los ni&ntilde;os y adolescentes, as&iacute; como, en los padres la cultura del deporte.</P>      <p align="justify">La occidentalizaci&oacute;n del estilo de vida, es decir, las dietas ricas en grasas saturadas y carbohidratos, aunado a la influencia de los medios electr&oacute;nicos es la principal causa de una vida sedentaria. Conocer el problema es el primer paso para resolverlo, sin embargo, la informaci&oacute;n existente sobre obesidad infantil no es tan amplia comparada con la que se presenta en la enfermedad adulta, por lo que es necesario que los profesionales de la salud desarrollen estrategias encaminadas a prevenir la enfermedad en las primeras etapas de vida.</p>      <p align="justify">Las enzimas producidas por el sistema gastrointestinal en respuesta a los estados de vigilia y saciedad permiten entender que la obesidad no solo involucra los factores adquiridos como el sedentarismo y la malnutrici&oacute;n, pues tambi&eacute;n se ve reflejado en los mecanismos compensatorios end&oacute;genos, como es la s&iacute;ntesis y se&ntilde;alizaci&oacute;n de las hormonas anorex&iacute;genas y la grelina, en su calidad de orex&iacute;geno. Sin embargo, estas v&iacute;as de se&ntilde;alizaci&oacute;n de la saciedad abren un panorama amplio para el dise&ntilde;o de mol&eacute;culas que pudieran actuar sobre los receptores de dichas hormonas que permitan tratar a la obesidad de una manera menos agresiva que con los tratamientos utilizados a la fecha.</p>      <p align="justify">Si bien, se han empleado diversos medicamentos para combatir la obesidad con relativa efectividad, tambi&eacute;n se ha demostrado que su consumo a largo plazo generan efectos adversos, por lo cual, ante esta problem&aacute;tica en nuestro grupo de investigaci&oacute;n, dedicado al dise&ntilde;o, s&iacute;ntesis, y evaluaci&oacute;n de los posibles efectos biol&oacute;gicos de compuestos org&aacute;nicos, se est&aacute; proyectando el desarrollo de mol&eacute;culas que pudieran emplearse en un futuro como complemento en el tratamiento de la obesidad. Sin embargo, es de vital importancia considerar que el entorno familiar y las costumbres propias de la poblaci&oacute;n fomentan el alto consumo de alimentos ricos en grasas saturadas, por lo que el sector salud ha hecho grandes esfuerzos por lanzar campa&ntilde;as donde se concientice tanto a los padres como a los infantes sobre la importancia de un estilo de vida sano, que incluye una dieta balanceada y un r&eacute;gimen de actividad f&iacute;sica que involucre a todo el n&uacute;cleo familiar, fomentando tambi&eacute;n la convivencia.</p>       <p align="center"><font size="3"><b><u>REFERENCIAS BIBLIOGR&Aacute;FICAS</u></b></font></p>      <!-- ref --><p align="justify">1. S&aacute;nchez-Castillo CP, Pichardo E, L&oacute;pez P. Epidemiolog&iacute;a de la obesidad. 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