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A keto or ketogenic diet is a nutrition plan that focuses on high fat and low carbohydrate meals to put the body into ketosis. The body normally uses carbohydrates to produce glucose. The body burns glucose as the primary source for energy. You lose fat on a keto diet because during ketosis, the liver converts fat into fatty acids and ketones to burn fat as the main energy source. Keto diets are used for weight loss, treating epilepsy and body building.