Introduction:

Every day, people make different decisions regarding the food they choose, which in turn determine their eating habits. The reward system (RS) allows associating certain situations to pleasure, which influences subsequent food choices.

Objective:

To describe how the RS influences the selection of foods in middle-aged and self-reliant older adults.

Materials and methods:

A literature search was conducted in PubMed and SciELO. Articles written in English and Spanish and published between 1996 and 2018 were included in the search; the following search terms (in both languages) were used: "food choice", "reward system", "nutrition", "adult", "elderly", "nutritional status" and "aging".

Results:

50 articles met the inclusion criteria. Only 1 study was written in Spanish; 22 were conducted on older adults and the rest on adults between 20 and 40 years old.

Conclusions:

Studies on eating behavior in general and on food choice in older and middle-aged adults in particular, are scarce. Therefore, further research in the Latin-America is needed to analyze the processes underlying the RS and its relationship to food choice, and how these processes change as people age in order to predict possible eating behaviors and implement effective interventions, since a healthy diet is essential for healthy aging.

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