Indigestible energy losses from protein appear in the stool, while indigestible energy losses from carbohydrates appear in the urine.
False, indigestible energy losses from all the macronutrients, carbohydrate, protein, and fat, appear in the stool. Since protein contains nitrogen, the body must also remove the nitrogen and excrete it as urea in the urine, which represents a metabolic energy loss.