A new study linking animal protein-rich diets to increased mortality in middle age adds fuel to the controversy over how much protein — and from what sources — is ideal for health. One thing that seems pretty clear: It doesn't hurt to go heavy on the greens. iStockphoto hide caption

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Government workers exercise at their office in Mexico City, August 2013. To counter the obesity epidemic, the city requires all government employees to do at least 20 minutes of exercise each day. Tomas Bravo/Reuters /Landov hide caption

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A crostini of smoked trout, hard-boiled egg, aioli and roe at The Red Hen in Washington, D.C. Owner/Chef Michael Friedman says Mediterranean cooking is simply a tweaking of basic cooking ideas. Courtesy of Brian Oh 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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Posting a picture like this on the fridge might seem like good motivation for weight loss. But scientists say it might instead inspire weight gain. iStockphoto.com 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/iStockphoto.com hide caption

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Older women on a diet don't need to stop eating out; they just may need to make wiser food choices to keep weight off. iStockphoto.com hide caption

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Federal health officials recommend 1,000 milligrams of calcium per day for people younger than 50, but some are overdoing it. iStockphoto.com hide caption

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A competitor stops for a cigarette after he broke down during the Enduropale race at Le Touquet Beach on February 22, 2009 in Le Touquet, France. Paul Gilham/Getty Images hide caption

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Jenny Craig brand ambassador and singer Mariah Carey (left) poses with Dana Fiser, CEO of Jenny Craig, at a press conference in New York City in November. Cindy Ord/Getty Images hide caption

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One recent study found that people were able to burn up an extra 450 calories a day with one hour of moderate exercise. That can include walking briskly, biking or swimming.

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French Laundry pastry chef Lena Kwak with the gluten-free flour she developed.

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