In a way, moderate-intensity physical activity is that "magic pill" a lot of people are looking for, because the health benefits go beyond keeping your waistline trim: Not only can it reduce your risk of cancer, stroke, diabetes and heart attacks, but studies have shown that physical activity can significantly improve the moods of patients with major depressive disorders.

These fatty acids rocketed to fame for their ability to decrease the harmful inflammation that is associated with many chronic diseases—including obesity. Crandall is quick to point out that researchers have yet to find a cause-and-effect link—so don’t expect to pop a fish oil supplement, for example, and drop 10 pounds. But, she says, getting omega-3s from whole foods such as nuts, seeds, and fatty fish like salmon is a good way to hedge your bets. And bonus: If you’re suffering from other kinds of inflammation, that can lessen your willingness to be active, omega-3s might help there, too. Find out the fat-burning foods you should add to your diet.

This may explain why the fat-burning effects of eating more protein were confirmed in a study published in the American Journal of Physiology. One group was fed a high-protein diet (just over 1 gram per pound of body weight per day) while the second group consumed an amount closer to the lower recommendation of the RDA (recommended dietary allowance). The group eating the higher-protein diet burned the most fat.