Researchers say that setting your thermostat a little lower can help you burn more calories. iStockphoto hide caption

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People following a 5-2 diet would eat lean protein and non-starchy vegetables two days a week. Heather Rousseau/NPR hide caption

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Illustration by Tim Robinson for NPR

A player avatar runs on a treadmill in the virtual world of Second Life. Researchers used the online game to see if it could help people maintain weight loss habits in the real world. Courtesy of Univeristy of Kansas Medical Center hide caption

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Front-loading your calories may help you lose weight. Gaelle Cohen/ hide caption

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Drinking diet soda and other low-calorie drinks may help you manage weight, but experts say plain old H2O is still the best way to go. Justin Sullivan/Getty Images hide caption

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Eating low-glycemic foods, or foods that take longer to digest, may help you feel fuller for a longer period of time. Robyn Mackenzie/ hide caption

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It doesn't take a transcontinental flight to end up out of sync with your body clock. It might just be that you stay up too late. hide caption

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Studies show that friends and family gain weight — and lose weight — together. Sean Locke/ hide caption

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