II. Nutrition
This is also the reason why I had to tell you that excessive consumption of potatoes is bad for the head. Excessive consumption of potatoes has the following effect on people. You see, potatoes contain little protein. Because they contain little protein, they are actually a good food for humans. And if a person eats potatoes in moderation with other foods, then it is a good food because of its low protein content. But the potato contains an extraordinary amount of starch, which has to be converted into sugar in the human body, first into dextrin and then into sugar. I told you at the time that if a person eats too many potatoes, his head has to work terribly hard; of course, because the head has to prevent the fermentation. That is why people who eat too many potatoes and therefore have to work their heads terribly to process the potato fermentation become weak-headed. In particular, the middle sections of the brain become weak; only the frontal sections of the brain, which do not have to work as hard to prevent potato fermentation, remain. And so it is precisely because of the fact that potato food has become widespread in recent times that materialism has come about, because it is produced in the forebrain.