I'm looking for a specific medical study...
19. Sebaceous Gland Hypothesis of Androgenetic Alopecia (Inaba 1985; Inaba and Inaba 1992a)
http://www.med-estetica.com/Cientifica/ ... droAlo.htm
I thought M.Barry's post at the bottom of this thread was interesting:
http://www.gourmetstylewellness.com/discussions ... eb8e5c17cc
OK, this isn't a medical source but it refers to a medical study:
Recently, a group of Japanese researchers reported a correlation between excessive sebum in the scalp and hair loss. Excessive sebum often accompanying thinning hair is attributed to an enlargement of the sebaceous gland. They believed excessive sebum causes an high level of 5-alpha reductase and pore clogging, thus malnutrition of the hair root.
Although this condition could be hereditary, they believe diet is a more prominent cause.
http://www.psoriasiscafe.org/hairloss-male.htm
I think this study was actually carried out as its quoted in many websites. Its just a matter of finding it.
"We studied the effects of growth hormone (GH) and insulin-like growth factors (IGFs), alone and with androgen, on sebaceous epithelial cell growth...IGF-I was the most potent stimulus of DNA synthesis. These data are consistent with the concept that increases in GH and IGF production contribute in complementary ways to the increase in sebum production during puberty."
Endocrinology
1999 Sep, 140:9, 4089-94
http://www.all-creatures.org/aip/nl-21j ... kevin.html
I've written extensively about testosterone, culture and health in a previous column, but I should mention here that high testosterone is clearly implicated in hair loss and is closely related to various cultural factors that vary between societies. Cross cultural studies show that Japanese men who shift from their traditional vegetable based diet to a Western one high in animal foods begin to lose their hair. Prior to the introduction of animal fat into their diet after World War II Japanese people's hair was thick and healthy. High animal food intake raises cholesterol which contributes to male pattern baldness by increasing sebum production. Excess sebum that accompanies hair loss is due to enlargement of the sebaceous gland which is attached to each hair follicle. This increases sebum production, clogging pores, malnourishing the hair root and raising levels of the enzyme 5 alpha reductase which converts testosterone to the hormone DHT which causes follicles to shrink and hair to go into resting phase. Ex cess animal food in the diet also over-stimulates the adrenal glands, producing extra androgens, which raises testosterone levels in the scalp. Testosterone levels peak in the fall and are lowest in spring when hair grows most fully.
http://www.findarticles.com/p/articles/ ... 67857/pg_2
^^^
This is written by medic (i think, check it out)
The elevated lipid levels and anaerobic conditions in the comedones provide a suitable environment for P. acnes, and this organism increases in number. Propionibacterium acnes is the most important factor in the inflammatory process of acne. It produces bacterial lipases that hydrolyse the triglycerides in the sebum to form free fatty acids and low molecular weight neutrophil chemotactic factor. Neutrophils that are thus attracted to the hair follicles release active oxygen species. The free fatty acids and active oxygen species cause irritation and weakening of the follicular walls. The contents of the follicles enter the surrounding connective tissue because of the degradation of the follicles and the inflammation progresses from the formation of comedones to redness, papules, pustules, indurations and cysts.
http://www.jimronline.net/content/html/ ... icleID=213
^^
what do you think of this?
This is interesting:
Research has shown that sweat is much more effective than water at emulsifying fat located in the skin's sebaceous glands, and thus at removing the sebum and bacteria lodged in the fat.[citation needed] The vasodilation caused by the high temperatures also allow essential fluids to be transported to the skin's surface. This enhances the development of collagen, giving the skin a continued elasticity and wrinkle-free complexion
http://en.wikipedia.org/wiki/Sauna
Essentially the sequence is going like this:
Excess animal fat = excess cholesterol = excess sebum production = excess 5 alpha reductase = excess DHT in that specified area (maybe not DHT levels in the entire body) = starvation of follicle = hair loss
A question. Prostate problems / male pattern baldness were low in Japan. Prostate Problems / male pattern baldness are high in America (and in 2nd gen. jap/americans). surely diet has to be implicated?