You can't. If you want to lose weight, the best way is to do aerobic exercise, such as running (running for at least half an hour, because the first 15 minutes consumes muscle glycogen, and then burns fat). The fastest way is to skip meals for a few days and keep exercising. It is estimated that losing weight 15 kg in three days should be no problem, but it takes a lot of perseverance and is easy to hurt the body. Not recommended. Then control your diet and eat less greasy and high-calorie foods. Your stool is normal now, which means you are healthy. If you are not normal in the future, you should drink more yogurt containing probiotics (very effective) and eat more fiber foods such as bamboo shoots, celery and leeks. Moreover, these are healthy and not fattening. Also, I read what everyone wrote, and everything is correct. You can refer to us. If you can do this, you will be very healthy. I wish you a good figure as soon as possible! I wrote them all myself. )