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A keto diet is defined as eating in a way for your body to produce ketones. Ketones are produced by the liver from fat and that process is triggered by eating very little carbohydtrates and a decent amount of protein. The ketones are used by the body for energy. Thus, a keto diet essentially burns fat as the body's source of fuel. The fat is burned nonstop by your body. When your body produces ketones, it moves into a state of ketosis. The ketosis will burn fat without even worrying about fasting. That is, as long as you keep eating a ketogenic diet.