This might be the only thing you read about metabolism that isn’t trying to sell you something. Your metabolism is the rate at which your body burns energy. Your body uses calories for energy, like your car uses gas for energy. You need calories to power your body’s systems, such as digestion and circulation. But you also need calories to move. When you eat too many calories, you store them as fat. This is where things get complicated: Calories from sugar are more likely to b