Carbs and fat are your body’s two sources of fuel. A low-fat diet is high in carbs, so when you eat more carbs than your body needs, it stores them as fat. Atkins is an effective diet that transforms your metabolism from one that stores fat into one that burns fat. High carbohydrate diets raise blood sugar, which in turn signals the body to secrete more insulin—you wind up with more fat on your body and a “sugar burning” metabolism. The Atkins diet restricts foods that are known to raise blood sugar and insulin. Limiting carbohydrates forces your body to use fat for energy rather than sugar.