Fasting strikes at the root of this problem. Done right, fasting lowers our insulin levels and helps reset our metabolism, without any harm to our health. Different lengths of fasts have different effects, but the basic idea is to deplete your body’s stored sugars until it starts burning fat. Some parts of your body, such as the brain, still need some glucose but mostly use an alternate fuel, ketones, which are made from body fat. Strictly speaking, there are no essential carbohydrates.
