Introduce a method I have experienced personally to this friend. The whole process of losing weight *** 12 days. For the first three days, I only ate fruit, any kind of fruit will do, but I was not full. I can eat when I am hungry. For the second three days, I only drank milk and yogurt and could not eat anything else. In the last six days, we can eat fruit, yogurt and milk together. At that time, I was afraid that I couldn't stick to it, so I ate this diet meal with my colleagues. I encouraged each other. Twelve days later, I lost eight pounds, and I didn't feel bad at all. I'm not worried that controlling my diet will hurt my stomach. I eat it in summer when there are plenty of fruits.