If you are talking about the over counter drug Alli, I would not recommend it. Taking it lowers fat soluable Vitamins A & D, which we know plays an important part in our health. It also doesn't distingush the difference between good and bad fats in your diet. We all know the importance of healthy fats in your diet, and Alli removes them. It can also have uncontrollable stool movements, which could also lead to problems.