Don't believe what the man above said, only that it is mainly water. No matter whether you are dieting or exercising, the main thing you lose is water, but you can rest assured that there will be a lot of fat in your 40 kg. Of course, because of your diet, if you take an extreme diet, it will definitely be unhealthy. If you go on a general diet, it will be correct. Diet control is also the most important part of losing weight, so practice two points and eat eight points. Now that you have lost 40 pounds, I don't know how big your base is. If you have recovered to normal weight, I suggest you do more exercise, both aerobic and anaerobic, or you can adjust your diet and gradually return to normal diet. In this process, try to eat healthy food, and don't touch sweet fried chicken with messy drinks. Also, you should remember that sticking to a diet habit for more than three months can really change your intestinal flora, otherwise it will be the intestinal flora you ate before. This problem is very complicated, but it is easy to rebound if it is not changed. Also, when you really want to eat sweet, I suggest you try diet drinks and zero-calorie carbonated drinks. That one has no calories or sugar. Don't buy zero-calorie coke because it tastes bad. I suggest you drink zero-calorie Sprite, which is delicious. However, drink as little as possible, reduce your dependence on sugar, and drink a little more when you really want to drink.