In a previous article, I summarized the current state of scientific knowledge regarding individual carbohydrate tolerance. There is exciting, emerging research in this area, but from a clinician's point of view, it is already clear that differing amounts of the macronutrients (protein, carbohydrates and fats) affect individuals differently.
While there are best practice guidelines for various desired outcomes, there is a large degree of individuality between the prescriptions for individuals. This variability is dictated by practitioners’ biochemical individuality, metabolic typing, or other circumstances. At this point in time, there is no accepted way to determine the macronutrient ‘tolerance’ of an individual, except in those cases where a specific diet is required due to a disease or disorder (such as a ketogenic diet for epilepsy).