The only thing I know about it is that some of them put extra stuff into the food to make you feel more full after eating, and it has the tendency to make you feel bloated and gassy. I've heard that from ppl who have tried them. They probably use protein powder - the same stuff in those Special K and other protein bars that keep you full for hours. That is probably why they work - the food acts like its own appetite suppressant. SO, if over-eating is your problem, it would probably work, but a 99 cent protein bar before meals would probably be just as effective.
at 4:50 PM on Oct. 20, 2009