Since the ketogenic diet and other low-carb diets Ultra Keto X Burn purposely restrict your intake of carbohydrates, your body is forced to use its fat stores for energy once you've depleted your glucose stores. A Keto diet, also known as a Ketogenic diet or low-carb high-fat diet is extremely low in carbohydrates, as the name suggests. On extremely low-carb diets, the body starts breaking down the stored fat to produce ketone molecules and the entire body, including the brain, switches to ketones as a source of fuel. People on a ketogenic diet may notice weight loss in the first few days, but this is typically just a reduction in water weight.