II. Nutrition
If you eat too many potatoes as a child or very young person, your midbrain will become extremely weak. But the midbrain contains the sources of the most important sensory organs. The midbrain contains the four-mound body, the visual mounds and so on, and excessive potato consumption can even weaken vision because it has its sources in the midbrain. And some eye diseases in old age are caused by the fact that a person was raised on too many potatoes as a child. The person then becomes visually weak, weak-eyed. It is really the case that in the past, people in Europe became visually weak much less often in old age than they do now. And that in turn stems from the fact that, in addition to what otherwise affects the eyes – but that does not even have such a strong effect because it does not work internally, electric light and so on – the excessive consumption of potatoes has a very harmful effect on the eyes, on vision and even on the sense of taste – even on the sense of taste! You see, that is where the following comes from. Suppose a person eats too many potatoes from childhood on. You will often see this in later life: the person never knows when he has had enough because his taste has been spoiled by eating too many potatoes. In contrast, a person who has not eaten too many potatoes knows instinctively when he has had enough. So the instinct, which is more tied to the midbrain, is spoiled by excessive potato consumption. This is what has emerged particularly strongly in recent times.