" FASTING WORKOUTS. A fasting workout is a long, moderate-intensity workout undertaken in a fasting state—that is, without a meal beforehand and without carbohydrate consumption on the bike. When you deprive your muscles of carbohydrate in a long workout, they burn a lot more fat. Such workouts also boost general fat-burning capacity. I suggest that you perform one fasting workout per week during a quick start. "

― Matt Fitzgerald , Racing Weight: How to Get Lean for Peak Performance