Like Alan, I enjoy preaching against nutritional dogma that is often so subtle that most people don't realize their following it. I also enjoy teaching against performance dogma.
From what I can tell, a better way to lose weight is possibly to lower fat actually. While being on a calorie restricted diet with carb restriction, physical exercise is sometimes quite difficult. As long as the person is genuinely eating enough lipids, they'll be fine. If 5% of their diet is fat....their cactus.