Four pregnant women sit in lotus position. Thomas Northcut/Getty Images hide caption

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Jorje Mendez has lost more than 45 pounds through weightlifting and other lifestyle changes. Trainer Johnny Gonzales, right, helps prediabetic patients at the gym he set up at the Lake County Tribal Health Clinic in California. Farida Jhabvala Romero/KQED hide caption

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Leahya Ellis and other spinning class participants use exercise as a way to shake away stress, anger and depression. Bastiaan Slabbers for NPR hide caption

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About 50 percent of the vegetables available today are tomatoes and potatoes, according to new USDA data. Lettuce is the third most available single vegetable. Legumes and all other vegetables make up 41 percent of what's available. Ryan Kellman/NPR hide caption

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A meta-analysis found that people on vegetarian diets lost around 4.4 pounds more than the control group (who had no change in diet), while those who went vegan dropped 5.5 pounds more. Marcus Butt/Ikon Images/Corbis hide caption

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The sporting options in Finland are everywhere. Here, two people take advantage of the ice on Lake Hiidenvesi to get some exercise. Sami Uskela/Flickr hide caption

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