Andrew Huberman· PhD
Now fat is going to be exclusively aerobic, meaning I'm going to use fat from the entire body, roughly equally. So you're doing a sprint up a hill, and your hamstrings or your glutes or your quads are on fire. You're not just going to use the fat that's directly in those hamstrings. You're going to lose it from the entire body. It has to go through lipolysis, so it's in this stored form in adipose tissue. It's got to get broken down, put into blood. Blood's going to have to go through your body, get taken up into muscle, taken up through muscle into the mitochondria. Then we're going to have to go through this process called beta-oxidation.