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By far the most common form of hair loss is determined by our genes and hormones: Also known as androgen-dependent, androgenic, or genetic hair loss. This type of baldness is largely hereditary. One plausible theory to explain some of the difference between men and women is based on the angle of follicles and resultant sebum build-up. Recently, a group of Japanese researchers reported a correlation between excessive sebum in the scalp and hair loss. They believed excessive sebum causes a high level of 5-alpha reductase, the enzyme which converts testosterone into dihydrotestosterone (DHT), and pore clogging, thus malnutrition of the hair root and a shift into the resting phase. The researchers note that Japanese hair was thick and healthy, with a small gland and little scalp oil, until large amounts of animal fat crept into their diet after World War II.
Most doctors agree that if you have a oily scalp with thinning hair, frequent shampooing is advised.
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