Since I'm not eating lunch, I usually don't go for the Krispy Kreme donut on a fasting day. I like to eat something that's going to keep me full longer, and that, by default, means I'm eating healthier since loading up on sugar isn't going to provide enough sustainable energy throughout the day.
The best part of this diet is that I don't necessarily have to skip lunch -- I could distribute my calorie budget differently for the day. I could consume 150 calories for breakfast, another 150 for lunch, and 200 for dinner, but I choose to do without lunch.
So I fast on Mondays. What do I eat the rest of the week? Whatever the hell I want, that's what! Seriously, you should see what I actually eat. Admittedly, I treat Tuesdays like a "recovery day," and there have been times when I've woken up with residual "hanger" from Monday and tried taking down a monster breakfast. It did not go well. It's as though my stomach is smaller on Tuesdays and I have to listen to it a little closer and let it tell me when it's ready for food. If you're trying to get a handle on portion control, though, that could be a benefit.