The secret is that insulin levels are low when fasting. When you are in a fasted state, your body can burn fat that has been inaccessible during the fed state. The reason the body cannot access the stored reserves is that we do not enter the fasting state until about 6- 12 hours after the last meal, it’s rare that our bodies are in the fat burning state. Fasting forces your body to go into a fat burning mode, something that you rarely get into when on feeding mode.
Fasting state leaves no stone unturned in ensuring that the excess fat is used because the body does not have access to a recently consumed meal to work or to tap energy from, so it is more likely to turn to the fat reserves stored in your body as it is the only energy reserve readily available. On a normal eating schedule, insulin levels are always at a high, and therefore any additional food you put into the body will be stored as fat. Intermittent fasting is all about educating your body about the reserves of energy available, guiding it to use the consumed food more efficiently, and helping your body to use fat as fuel when we deprive it of new food to constantly work on. It is fascinating to know that the human body has well-developed mechanisms to deal with periods of low availability of food and is extremely adaptable. To put it in simple words, intermittent fasting is the process of switching the body from burning glucose (which is readily available) to burning fat (which is not readily available). When the body is depleted of food, stored food is naturally released. Intermittent fasting is one of the most efficient ways to ensure that low insulin levels are maintained, as blood glucose levels remain normal when the body switches to burning fat that has been stored. Lowering the insulin levels will also cause the body to get rid of excess water and salt, and the body stops retaining water.