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What is it about junk food--the sweet, the salty, the fatty--that is so completely irresistible? For one thing, it's everywhere. "Americans have about 20 'food contacts' per day," says Andrew B. Geier, a PhD candidate at the University of Pennsylvania who has published eating-behavior research. "That means not just eating but having food available, like the candy dish at work." In contrast, the French, for example, have about seven per day.
Why? Other nationalities don't snack much; Americans, two-thirds of whom are overweight, live via snacking. The result is not only cosmetic (too-tight jeans) but deadly: High-fat diets are linked to cancer and heart disease, and high-sugar and high-carb diets can lead to diabetes.
Thankfully, science is now yielding new clues to the prompts that make us eat ... and stop eating. And hunger is the least of it. Here are six rules to eat by, ...