'Every cell in your body plays a role in energy metabolism -- the process of turning the food you eat into energy that keeps your heart beating, lungs pumping, and muscles moving. The faster your basal metabolic rate, the more calories you burn. And just like there are ways to speed it up -- by increasing muscle mass and exercising -- certain habits can hit the brakes on your natural calorie-churning engine. Here are 13 things sure to slow you down.'
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