I do eat a healthier diet and I do go to the gym.. at least 4 times a week, sometimes 5.. even if its just to walk on the treadmill or doing something more intensive. But like I said, because I do eat a healither diet, I never have 'leakage' - the idea of alli is.. you eat something that has, just say.. 8 grams of fat in it.. Alli will keep your body from breaking down about a quarter of that. But no, that isn't going to turn into leakage.
From what I understand, after speaking with those who took Alli without changing their diets, if you were to eat a grease covered pizza or a batch of hot wings while taking Alli, you will have oil in the toilet [not crapping your pants.. but it does make you have to go.. but no, you won't be running for a toilet [unless you ate something with an extremely high fat content]]. But no one I have spoken to has 'crapped their pants' but they do say if you don't eat healthy as well, you will see oil in the toilet after you do use the restroom.
I know it isn't for everyone but as someone who uses it [without having the mentioned side effects] I figured I'd just put in my 2 cents while everyone else, who does eat healthy and exercises, believes that if you use this product, you will shit yourself. The page itself even says "Because of the way in which alli works, eating meals with too much fat may cause side effects known as treatment effects."
