J.S.
I personally have not tried alli but my sister is using it now. She says it is training her to eat better because the negative effects from eating a lot of fatty foods (pizza, hamburgers, french fries, etc) is very nasty. Basically the drug keeps your body from absorbing half of the fat found in these foods. So, what does your body do with what goes in? It comes out in its oil form instead of poop. It leaves a greasy nasty ring in your toilet. It will just leak out your bum all day if you eat poorly. However, she did lose quite a bit of weight with it and she isn't as likely to eat the high fat content foods. My husband is a dr. and said he couldn't believe he made this over the counter. It is usually a drug they only give to grossly obese people. Hope that helps.