15 The More Fat You Eat, the More You Burn

“Humans can survive and thrive on a variety of dietary patterns,” says Andrews. “But manipulating fat intake doesn’t appear to be as important to body composition as other factors, such as aiming to eat a high-quality diet – minimally processed, with plenty of plants.” A ketogenic diet, in which 70% or more of your calories come from fat, pushes the body into a fasting-like state in which the body switches from using glycogen as a fuel source to using ketones. But it’s energy balance – not fuel source – that dictates weight loss and gain.