I have also seen this folk prescription, saying that it is obvious to lose weight by soaking three grams of medlar in water every day for three months. I tried, too. Although I am not obviously thin, I feel very comfortable. No diarrhea, but regular excretion. Maybe it varies from person to person. It still works for me. Every day is the same, just use Lycium barbarum water, persist for about a month, and lose 2 or 3 pounds. But don't soak more, or you will have a fever easily. Soaked together for about10g, and got a fever the next day.