I concur with Helen about Dr. Michael Mosely. He really investigates what is going on in your body when you eat food, and he was the one who started trying various fasting diets. The "alternate day fasting" that involves regular eating then a day of only about 500 calories (two or three of these in a week) helps level out some of the bad stuff. But be sure to get plenty of fiber on that.

Eat, Fast, and Live Longer. You can track down a lot of his other work from this starting point.