[mzarate06]

Having read his book, I can say that he's not selling red herrings.

He does make a clear, recurring, point in his book: the fitness and diet industry focuses too much on things that don't matter that much. E.g. low carb diets, avoiding "bad foods", cardio being the key to fat loss, and yes, metabolism.

My belief is that he mentions metabolism on his site to arouse curiosity, or calm worries, on one myth that fasting skeptics have: not eating frequently slows your metabolism, and to the point that it affects weight loss.

In fact, fasting doesn't affect your metabolism that much, if at all. Research shows it stays pretty steady during periods of fasting.

And through that fact, he's able to push your focus away from worrying about metabolism and on to what really matters: calorie consumption.