I like you, @GarrotTheThief.
I relate to everything in your last post. I was on a low-carb diet briefly, and I called it "The Bad Mood Diet". I was grouchy all the time, and also (sorry if this is TMI) irregular, which I'd never been before in my entire life. Carbs are necessary. As are proteins and fat. They just need to be consumed in reasonable amounts, and supplemented with exercise. It's as simple as that.
The problem is, people want instant results. That's why fad diets will always be popular.