To meet the challenge of emotional stress with proper nutrition, doctors have found that one nutrient — Vitamin B12 — has an amazing power to insulate the nervous system against emotional upset. A deficiency of Vitamin B12 may adversely affect the nervous system, writes J. MacDonald Holmes, M.D. in Medical News (4:67). Dr. Holmes makes note of the fact that Vitamin B12 helps to maintain the integrity of the “myalin sheath”, the fat like substance which forms a protective insulating sleeve around delicate nerve fibres. A deficiency can cause such emotional symptoms as tingling sensations in the limbs, numbness, shooting pains and feelings of hot and cold. The limbs feel stiff and weak, and sensations of touch, pain and temperature are blunted.