Matt Chan explains how to create a baseline Zone Diet plan for competitive athletes and how to intelligently deviate from it in this video shot at a CrossFit Competitor's Course at CrossFit Park City.

In Part 3, Chan talks about a Zone plan for someone who instead wants to lose body fat.

It comes with a similar warning: "There is no healthy way to underfeed an organism."

Chan adds: "If you have trained yourself—just like you would throw three workouts at a day, trying all sorts of different combinations of workouts—we're going to train ourselves to eat this stuff and see what works best for us."