In Case of a Snack Emergency

If you really want to snack -- and nothing else will do -- it may be possible to trick yourself into eating less.

People tend to eat the same number of food portions, no matter what the portion size, according to a study published in Psychological Science. Researchers offered participants a snack in two sizes: one small or one large Tootsie Roll, one small or one large scoop of M&M's, or one whole or one half-sized pretzel.

Regardless of which serving size subjects chose, they ate the same number of portions -- so the smaller-portion eaters ate less overall. To make this work for you, just choose smaller snack sizes and pay attention to the number of servings per container.