" regardless of how many calories you burn, consuming excessive processed carbohydrates ultimately inhibits your ability to access and burn stored body fat efficiently around the clock. Instead, all that arduous training results in an increased appetite, again thanks to insulin-driven sugar cravings from poor food choices combined with, or as a consequence of, overly stressful workouts. "

― Mark Sisson , The Primal Blueprint: Reprogram Your Genes for Effortless Weight Loss, Vibrant Health, and Boundless Energy