There's no question that obesity is a serious problem in the United States. More than a third of American adults are obese, and a big contributor to this alarming statistic is our food: it just keeps getting bigger. The average muffin is 250% larger than it was in the mid 1990s, and the average spaghetti dinner has doubled since then. But why? A big reason is consumer demand. When businesses make their products bigger, they give us more bang for our buck. We buy the bigger product, profits increase, and the cycle continues. So how do we maintain our waistlines around ever-growing portions? The National Heart, Lung, and Blood Institute has a few tips: when dining out, swap a side salad for fries, and eat only half of the entree, either by sharing with a friend or packing half to go.