I can't really say that I've tried eating like these people, quite. Low fat, sure. But with a very different set of staples, lots of wheat, a fairly refined diet, totally different lifestyle. Personally I did do pretty well when I did it, but it ripped much of the pleasure out of eating for me, so it never lasted long enough to see whether it would have done me any permanent harm. Certainly carbohydrate in the forms I was actually willing to eat on a regular basis did me no good.