A snack is a portion of food often smaller than that of a regular meal, that is generally eaten between meals. Snacks come in a variety of forms including packaged and processed foods and items made from fresh ingredients at home.
Snacking is not just a modern phenomenon and throughout human history people have been creating snacks foods specifically designed to be eaten between designated meals. Our ancestors grabbed food whenever it was available. Our even more distant primate ancestors grabbed the fruit from the trees as soon as it appeared near hand.
Traditionally, snacks were prepared from ingredients commonly available in the home or the leftovers of the previous night. Often leftovers, sandwiches made from cold cuts, nuts, fruit, and the like were used as snacks. The Dagwood sandwich was originally the humorous result of a cartoon character’s desire for large snacks. Beverages, such as coffee, are not generally considered snacks though they may be consumed between meals like a snack, or along with snack foods. A beverage may be considered a snack if it possesses a substantive food item (e.g., strawberries, bananas, kiwis) that has been blended to create a smoothie.
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
– Blatantly stolen from Wikipedia and http://EzineArticles.com/1743420