This page contains a series of short films of a lecture from a guy called Todd Becker who is interested in the role of moderate stress as a positive force applied to health, nutrition, rehabilitation and psychology. This is a talk about Intermittent Fasting and you'll see it in 5 short bits .. .
Very informative .. and the second to last two short videos gives a good practical and scientific explanation of the role of fasting on insulin .
OK its not DR MM ( and this guy is not saying he's an expert although you'll see how well its working for him ) but it's an accessible and pretty good explanation of why IF works - do take a look if you have time.
He advocates a 19 hour fast to ensure that you are getting the greatest benefits from this WOE.
The rest of the blog is well worth looking at.