Proper growth and activity of the brain and nervous system are promoted by a healthy flow of blood. Pure air and sufficient protein food properly combined and proportioned with carbo-hydrate and fatty foods, rich in prosphates and minerals, are essential. Choose more of the lighter form of protein and starchy foods, as fish, eggs, almonds, green peas, bacon, a moderate amount of lamb and beef, rice, sago, wheat, and vegetable gelatines. Foods rich in minerals are celery, apples, tomatoes, greens, oranges, and practically all the fresh fruits and vegetables, especially the small berries. Melons and starchy vegetables in large quantities are suitable for muscular workers. Use as little as possible of so-called pure chemical substances, such as refined sugar and flour.

Avoid poisonous beverages, tobacco and all forms of drugs. Sleep at least nine hours in a well ventilated room, facing east or south. Avoid constipation. Combine mental work with moderate amounts of useful and enjoyable exercise, or physical work. Protect the eyes from strong artificial light. Keep the feet warm. Relax before and after meals. A certain amount of manual labor is absolutely necessary for the brain-worker. It favors deep breathing and creates a demand for more air and water, and thus improves digestion, oxidation and nutrition. The body poisons are carried off quicker and nervous headaches and despondency are avoided. Short walks out of doors before retiring are very beneficial for people who suffer with cold hands and feet.