Long-term dieting, the body not only does not consume fat, but also gives priority to decomposing muscles to obtain nutrition, because muscles need 24-hour uninterrupted heat supply, just like greedy "vampires". Now that you are on a diet and the calories are not enough, your body will give priority to breaking down your muscles into nutrients, so that you can kill two birds with one stone while getting rid of vampires. It's like an already poor family, and there are many things that consume money. Of course, he will first want to sell these things to reduce expenses and exchange money, which is obviously the best solution. Your body is smart and doing the same. Fat is nutrition, and basically does not consume calories when worn on the body. Of course, the more storage, the better. This is why dieting only reduces muscle and not fat.