So to answer the question "How to lose fat fast". There is no fast way of losing weight, or in other words, you lose fat just as fast as you want to. If you eat a lot beneath maintenance, you will lose fat fast. But if you eat just below maintenance, it will slowly burn away. What I recommend and what any doctor probably will as well, is to change your lifestyle, so that you live an active life, and eat healthy. Then the fat loss will take care of itself. If you are used to living and active and healthy life, it will not feel like a temporary diet, but rather a lifestyle. And it is no doubt, that the body does not like a lot of changes. The body always wants to stay in homeostasis, meaning that I wants everything to be in balance. And it "confuses" the body that you keep changing the diet and exercise. Even tho it has been discussed a lot, that it is good for the body to once in a while to get "surprised". This can for example be cheat days, where you can eat what ever you want.
I can't stress it enough, that you must NOT go on some crazy 600 calories a day diet, to lose weight really fast. This won't help you in any way. It is one of the most unhealthy things to do, and it won't take a long time before you get sick, and completely destroy your body. If you start on an insanely low calories diet, the body will right away start to tear away your muscle, and you will have nothing to be proud of, when you reach to low body-fat (if you ever get so far). Also this can result in Anorexia. Also, even tho I have no scientific study to back me up right now, it has been mentioned quite a lot, that if you suddenly go on a very low calorie diet, your body will respond with burning as few calories as possible as a defense mechanism. This is because your body registers that something is very wrong, and does not want to burn all it's storage.
