🔥 Want to burn fat? There's only one energy system in your body that can actually do it. Your body has three energy systems for producing ATP — the energy currency of your cells — fueled primarily by carbohydrates and fats. But here's what most people don't know: only one of those three systems can burn fat. That's the aerobic energy system (also called oxidative phosphorylation). It requires oxygen, produces carbon dioxide as a byproduct (literally one of the main reasons you breathe), and is