Glucagon is insulin’s metabolic opposite—but it rarely gets the attention it deserves. While insulin drives energy storage, glucagon signals the body to release and burn stored fuel. Contrary to common belief, glucagon doesn’t burn fat by pulling it directly from fat cells in humans. Instead, its primary fat-burning action happens in the liver, where it suppresses fat creation, increases fat oxidation, and supports ketone production when insulin is low. Understanding the balance between insulin and glucagon is key to improving metabolic health and sustainable fat loss.