EXPLAIN THE RATIONAL BEHNIND FAT LOADING AND THE EFFECTS ON PERFORMANCE DURING EXERCISE Our knowledge of how the body uses nutrients as fuel, has placed focus on dietary carbohydrates, with most serious athletes at least somewhat engaged in carbohydrate "loading." Now, however, many athletes are considering "fat loading" instead. This module explains how fat loading works and critically reviews the effects of fat-loading on the performance of trained endurance and ultra-endurance athletes.