Martin Berkhan is looking at this way of eating, with a few tweaks, primarily for body re-composition purposes - i.e. generally trying to increase muscle mass while reducing fat.
Martin's blog has pointed to a really useful interview that he has done with Leigh Peel. It explains a bit of his background, experience with and approach to IF.
you can read the interview by clicking here
If you are interested in IF, some of my previous posts are at:
Fasting burns belly fat
Intermittent Fasting and Exercise
Another possible benefit of fasting
More on intermittent fasting