Nutrient Timing and Body Composition

Nutrient timing refers to the strategic scheduling of food intake, particularly of carbohydrates and protein, in relation to exercise, sleep, and the body's daily circadian rhythm, based on the premise that when nutrients are consumed can influence how they are metabolized, not only how much is consumed. The body's metabolic machinery does follow a circadian pattern: insulin sensitivity, for instance, tends to be higher earlier in the day and to decline in the evening in most people, and core processes such as digestive enzyme secretion and gut motility also fluctuate over roughly 24-hour cycles governed by molecular clock genes present in the liver, gut, and other peripheral tissues, not only the brain's central circadian pacemaker. In the specific context of exercise, consuming carbohydrates and protein in the hours surrounding a workout has traditionally been thought to support glycogen replenishment and muscle repair more effectively than the same nutrients consumed at other times of day.