Sheryl Underwood Keto Reviews: A Natural Approach to Weight Loss The capacity of the ketogenic diet to use the body’s fat reserves as the main source of energy has generated a lot of attention in recent years. As cholesterol is broken down into fatty acids and glycerol, ketones are created. After then, the pancreas secretes insulin, which causes cells that are insulin-sensitive to absorb sugar for energy and store any excess sugar as glycogen.