Hi
The effects of eating fatty foods whilst on Xenical are pretty horrific - most users will have similar embarrassing stories about "accidents", particularly in the early days - but thats what makes you change your diet ultimately and by eating as low as fat a diet as possible i managed to minimise the effects and lost 2 stone in a very short time. Unfortunately you cannot eradicate these effects totally as most foods have a small trace of fats and as said in a previous post it helps to be prepared and have access to a loo. I only had to come off them because i changed to a job where i visit people in their homes and they are not always the kind of places you want to be using their facilities !!, otherwise i would still be on them.
Like most weight loss meds, they aren't for everyone - but i would recommend giving them a try. They are the safest of the prescription drugs, so always a good starting point.
Good luck