A snack is a small portion of food eaten between meals. The food might be snack food—items like potato chips or baby carrots—but could also simply be a smaller amount of any food item.
Snacks and health 
Excessive snacking has been implicated in the increasing prevalence of obesity in many countries.
Healthy snacks include those that have significant vitamins, are low in saturated fat and added sugars and have a low sodium content. Examples of healthy snacks include:
Snacks and cognition 
A Tufts University, Department of Psychology empirical study titled, "Effect of an afternoon confectionery snack on cognitive processes critical to learning" found that a consumption of a confectionery snack in the afternoon improved spatial memory in the study's sample group, but in the area of attention performance had a mixed effect.
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