The health of the glandular system depends on the nervine stimuli and, if the nervous system is healthy, the glands are stimulated properly. Back bends energise the system in a stimulative manner. Age-related weakening of the endocrine glands does not affect the executive who practises yoga regularly. The immune system is vulnerable to malfunctioning. Lack of sleep is one of the most potent forces generating stress on the immune system, weakening the functioning of the cells.
Improper diet is another cause for ill-health of the immune system.
High polyunsaturated fat content in the diet affects the genesis of the lympho-cytes in the bone marrow. It is preferable to stick to a vegetarian diet as it is low in fat. Studies have shown that, in vegetarians, the killer cell activity of the immune system is twice that of omnivorous controls. Emotions also affect the immune system. High levels of noise are also known to affect the immune system.