III. On Nutrition

It is the astral body that enables man to have feeling and perception. When I feel a blow on my hand, it is not the physical body in which the feeling arises; if it were, then everything physical would have the faculty of feeling. The flesh is pressed back, and then the muscle; the flesh in the muscle is forced away from the astral body and then I feel something—in the astral body. All feeling arises in the astral body. But the astral body must be able to carry out its functions in the right way. I have told you that if the astral body, even by day, is in a sleepy condition and not actively at work, corpulence sets in and deposits of fat accumulate. Or again—if a man is active only in his head, in his intellect, fats are deposited. But the astral body which is also at work, for example in speech, needs the carbohydrates to be present all over the body, not only in the head. The astral body has to move the legs, the hands, and so on. It needs the presence of carbohydrates all over the body. If a man's food contains carbohydrates in the form of rye or wheat, the forces of these substances stream into the whole body; but if the food consists only of potatoes, the forces accumulate up there in the head and the man becomes weak and debilitated; his astral body cannot be as active as it ought to be. So that what is spiritual in the human being becomes exhausted, less and less active, when he cannot provide his organism with carbohydrates. This is impossible if he feeds entirely on potatoes because the head has so much to do that the body has to suffer.