Baldness involves the state of lacking hair where it often grows, especially on the head. The amount and patterns of baldness can vary greatly; it ranges from male and female pattern alopecia which involves the loss of some of the hair from the head. You may have also heard similar forms such as:
Alopecia Totalis- the loss of all head hair
Alopeica Universalis- the most extreme form, which involves the loss of all hair from the head and the body.
There are a number of genetic factors which determine a person's susceptibility to androgenic alopecia, including androgen receptor polymorphisms, 5-alpha-reductase levels in the scalp, androgen receptor density and distribution in the scalp, and other factors, some of which may not have been discovered.
Daily, vigorous aerobic exercise (as opposed to short workout periods designed to raise androgen levels and build muscle, or more sporadic exercise) and a diet which is adequate yet more moderate in terms of fat and total calorie intake have been shown to reduce baseline insulin levels as well as baseline total and free testosterone.
Lower insulin levels and reduced stress both result in raised levels of Sex Hormone Binding Globulin (SHBG). SHBG binds to testosterone, and prevents it from circulating free in the blood. Only free testosterone is converted to DHT. It is the level of free androgens and not total androgens which is relevant to the levels of DHT in the scalp and the progression of MPB. In short, aerobic exercise is capable of significantly lowering DHT.
Androgenic alopecia has been shown to correlate with metabolic syndrome. Medically increasing androgen levels does not worsen this condition, demonstrating that androgens do not cause metabolic syndrome. Instead, high insulin levels seem the likely link in the demonstrated correlation between baldness and metabolic syndrome. This reinforces the notion that behaviors which help to keep insulin levels low and reduce chronic inflammation might also help to preserve hair.