Low muscular carbohydrate content during heavy sustained exercise is well known to impair physical performance . Acute exogenous delivery of ketone bodies elevates ketone levels without the prior depletion of muscle carbohydrates necessary to induce ketosis via endogenous production. Consuming plenty of healthy fat can boost your ketone levels and help you reach ketosis. Indeed, a very low-carb ketogenic diet not only minimizes carbs, but is also high in fat. Ketogenic diets for weight loss, metabolic health and exercise performance usually provide between 60–80% of calories from fat.