it's suppose to reduce the amount of fats your body will absorb - so where does that fat go?? poopy pants. that's why you have to modify your diet intake - less fatty foods. and you are suppose to suppliment with vitamins A, D, E, and K (the fat-soluble vitamins b/c you lose some of them in the poopy pants)
i honestly don't recommend any otc or herbal diet pills at all - i get asked questions about stuff like metabolife, relacore a lot in the pharmacy.
you don't gain weight overnight - so you shouldn't expect it to all come off at once. watch your food intake (calorie/portion control) and exercise.
i use to be blessed with a high metabolism, but with age, it slowed down. i was never a calorie counter but i now watch my portion size - restaurants will serve you 2-4 times the amount you really need to eat (i see that a lot with pasta dishes). i was raised to finish everything on my plate - i now let myself take the leftover home instead of eatting it all.
i still like to indulge in an in-n-out cheeseburger, well-done fries with spread....but that's once in a while now. if i ate like that all the time and took alli, i'd have crazy poopy pants.