Ketogenesis is a metabolic process that occurs in the liver when the body lacks sufficient carbohydrates for energy. During this process, fatty acids are broken down into molecules called ketone bodies, which can be used as an alternative energy source. This typically happens during periods of fasting, prolonged exercise, or low-carbohydrate diets. The primary ketone bodies produced are acetoacetate, beta-hydroxybutyrate, and acetone. These molecules can be utilized by various tissues, including the brain, to meet energy demands when glucose is scarce. Ketogenesis is a key component of the ketogenic diet, which aims to promote fat burning for weight loss and improved metabolic health.