What's the worst weight loss product you've ever eaten, and what's the result?

The worst weight loss product I have ever eaten should be laxatives, because I always thought I was particularly fat and that diarrhea would make me much thinner, so I went to buy some medicine. As a result, I found that I not only didn't lose weight, but also collapsed myself, which did great harm to my health and I dared not eat from now on.