Mark Sisson's "Closed Loop" Theory of Metabolic Efficiency

Mark Sisson sits down with his co-author Brad Kearns to discuss the topic of metabolic efficiency and why he thinks he doesn't eat all that much for someone of his size and activity level.

In Mark's recent "What I Eat In A Day" video, many people commented on how little Mark actually eats in a day.  This video is a bit of a followup and addresses why he thinks that is.

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