"So what happens when we stop eating? The body first uses up the glycogen stores in the liver. That might take 12 hours, or 24 hours. Afterwards, the body will have to use proteins (muscles) or lipids (fats) to produce the energy (glucose) it needs. The body is programmed to avoid breaking down muscle, and so the liver turns into a factory to manufacture ketones for fuel... But you don’t need to buy anything; just stop eating and your body will do the work for you... Sick cells, old cells, decomposed tissues, are burned away. This is the ultimate spring clean. It allows the body to eliminate toxins and metabolic waste at the same time as turning them into heat and energy... Next, the body will go for its fat reserves. Most of us have plenty of fat for the body to get busy on – and belly fat is an easy target... the process of ketosis is more than the body eating itself. While fasting, the body goes into repair mode... There is an impressive documentary available on YouTube called The Science of Fasting...the problem: fasting is free. Well, it’s not free, because you need to be medically supervised, at least to begin with, but there’s no money in it for Big Pharma."