Been thinking more about intermittent fasting. I blogged about this some in last month (here and here for example). I've been doing all of my early workouts without eating. There is one guy I came across that does serious heavy lifting fasted and he is huge (and also kind of a jerk, given his blog). So it must be doable, at least for some people.
Last night I watched a really good BBC documentary, Eat, Fast, and Live Longer. If you google it you can find it streaming online. Dr Michael Mosley experiments on himself with a feast and famine diet to reduce his risk of heart disease, diabetes, Alzheimer's; and cancer. He loses weight too, but his primary goal seems to be slowing the aging process. The blood work from these experiments is very compelling. It's worth watching, even if we only have n=1 anecdotal evidence.
Calorie restriction to low levels is dangerous for obvious reasons. But calorie cycling is an interesting theory that I am going to look into further. I am not going back to eating wheat or sugar but there are people who combine calorie cycling with a low carb diet. They seem to really enjoy it -- not just benefit from it, but enjoy it. And that's what it is all about.