I don't know what diet pills you are taking. If the diet pills contain botanicals, the causal relationship between melanosis coli and botanicals will be clear. Mainly:

1. After eating a plant laxative for a while, it will turn black.

2. Melanosis will gradually disappear after stopping using plant laxatives for a period of time.

So if it is to lose weight, it is not recommended to only take diet pills. You can lose weight by dieting and exercising. And taking diet pills for a long time will do some harm to the body. It is suggested that Jane Eyre eat normally and run for half an hour every morning and evening. Sticking to exercise will still make you slim down.