It is only that simple if you assume that all macronutrients are metabolized in exactly the same way which is not the case (example: fat does not stimulate insu

It is only that simple if you assume that all macronutrients are metabolized in exactly the same way which is not the case (example: fat does not stimulate insulin secretion, carbohydrates [for the most part] do, insulin is the primary regulator of fat storage). Treating the human body like a black box like that is vastly oversimplifying the biochemistry of the digestive process to our detriment.