A pizza from a Pizzomatic vending machine that bakes and sells pizzas in Germany. Public health advocates say the food industry needs to make concrete commitments to making healthier products to reduce chronic disease related to diet. OLIVER BERG/AFP/Getty Images hide caption

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First Lady Michelle Obama, accompanied by Darden chef Julie Elkinton, talks to Charisse McElroy, right, and her daughter Jacqueline McElroy, 9, during an event at Olive Garden in Hyattsville, Md. on Thursday. Manuel Balce Ceneta/AP hide caption

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Music has become an essential component of a workout for many exercisers. Sports psychologists say the right music can help optimize an exercise routine. iStockphoto.com hide caption

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A truckload of live turkeys arriving at a Cargill processing plant in Springdale, Ark., on Aug. 4. Cargill recalled fresh and frozen ground turkey products produced at the plant from Feb. 20 through Aug. 2 due to possible contamination from the strain of salmonella linked to 76 illnesses and the one death. Danny Johnston/AP hide caption

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Bacteroides are microbes that dominate the guts of people who eat more animal protein and fat. National Institute of Environmental Health Sciences hide caption

itoggle caption National Institute of Environmental Health Sciences