Are ketones a source of energy?

Yes, ketones are indeed a source of energy. When ketones are present in the body, they are metabolized into ATP, the energy currency of the cell, similar to how carbohydrates and fatty acids are utilized. Ketones are particularly noted for their efficiency, using less oxygen and creating less oxidative stress compared to glucose 1.

Ketones are a versatile energy substrate, preferred by organs like the brain and heart during periods of low glucose availability. This preference is due to ketones' ability to independently supply energy without downregulating other metabolic pathways 1 2. Additionally, they have unique signaling properties that contribute to their effectiveness, providing not just caloric energy but enhancing mental focus and recovery in athletic performance 2 3.

Ketones can be derived either endogenously through low-carb diets and fasting, or exogenously via supplements, which can help in both acute and sustained energy demands 4 5.