This is a deep dive into carbohydrate periodization with Drs. James Morton and Julien Louis where we explain the science behind our recommendation of FUEL FOR THE WORK REQUIRED (e.g., enough but not much more) and GLYCOGEN THRESHOLD (i.e., train to low levels). We also explore issues of sex and age, how bone health may be critically dependent on carbohydrate availability (not just total calories), and several other important topics.