Why Do They Work?
You are all absolutely right. There ain't no free lunch. I recommend trotting down to your library and checking out The Fat of the Land, by Michael Fumento, which is very helpful in sorting through all the weight-loss hype. Or, I can even save you the trip to the library. To lose weight, we need to EAT LESS and MOVE MORE.
The book is still an interesting read. I corresponded briefly with Mr. Fumento and he seems extremely hostile towards fat people, which is odd since he claims he used to be one, but he keeps his hostility out of his book and seems to have done his homework, with one exception. He claims Lane Bryant uses fat models and of course every woman in America (we all receive LB catalogs, whether we want them or not) knows they use the standard models who are 6 feet tall and weigh 100 pounds soaking wet. (Why they do this, I do not know; does anybody know?) However, that is a minor error, and if you follow his advice you will lose weight slowly and it will stay off. Good luck!