I used it and didn't have any problem at all. You can have no more than 10 or 11 grams of fat in your meal. I just made sure that I didn't go over, because, I didn't want any "treatment effects"!! The directions tell you to cut your fat intake a few days before you start on them, so if you follow the directions, you should't have a problem. Remember........if all else fails, read the instructions. Most of the people I know who have tried it had more trouble with constipation than anything else.
P.J.