I've had moderate eating disorders for a long time.
I was able to control my appetite briefly in my teens and the sense of power and mastery over my hunger was incredibly alluring. I went a little overboard on that and dieted myself to quite a small size, but it wasn't sustainable and I ballooned up after that and have struggled ever since.
I have never been able to achieve that mastery over hunger ever again, until I started a low carb high fat primal diet. I was able to go 24 hours without eating once a week and with hardly any hunger. I thought awesome, maybe I can attain the mastery and the low weight I had in my teens.
Well it was pretty easy at first because I had weight to lose. After a while, I had lost enough weight and the IF became very difficult. I got very cold, extremely cold. I worried I was slowing my metabolism.
I read the fast-5 book and thought maybe this is the answer to making fasting work for me. I made a couple of attempts and found that firstly I couldn't go that long without eating on a daily basis and secondly, I felt totally out of control. I felt out of control during the fast with out of control hunger and thoughts of food and out of control after breaking my fast with out of control eating and obsessive thoughts about how I would try harder tomorrow.
I realized I had better give it all up. I haven't fasted at all since then. I think it's a good idea to try it, but be on the lookout for negative results. It's not worth the negative results. The Primal Blueprint works just fine without fasting.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Current squat: 160 x 2