yello911 said:
Interesting. You need to go around and correct other sites on this because they are still saying it does.
I've actually done that a couple of times, but they don't really listen. It's surprising how the "feedback theory" seems to be so deeply ingrained into lay people. Almost everyone still believes it to be true, despite the scientific evidence against it.
yello911 said:
Can you post this experiment as I would be interested in reading it.
Here's an old post from my friend Kevin Davis from alt.baldspot a few years ago. He gives the relevant citations:
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From: thread (
[email protected])
Subject: Re: Too much sebum
Newsgroups: alt.baldspot
Date: 2001-06-03 12:49:48 PST
Here is a study which discusses sebum production and the factors that affect it. I also posted a paragraph from this study which discusses the false notion of a feedback system.
Bottom-line: washing your skin does not affect sebum production one way or the other (although washing will certainly remove sebum from the skin surface).
Kevin Davis
"Sebum secretion and sebaceous lipids." - published in Dermatologic Clinics, Vol. 1, No. 3, July 1983.
Excerpt:
"... These observations gave rise to a long-lived fallacy (1927-1957) that was posthumously christened the "feedback theory" by Kligman and Shelley (23). The idea was that sebaceous glands secrete only when necessary to replenish lipid that has been wiped or washed away. Nothing known about the physiology of sebaceous glands gives any theoretical support to this concept, and it has been thoroughly disproved experimentally (23).
Sebum is secreted continuously. The reason that lipid levels eventually cease to increase apparently is that the skin can hold only a certain amount of lipid in its crevices, and the rest tends to flow away from sites of high sebum production (23)."
23) Kligman, A. M., and Shelley, W. B.: "An Investigation of the Biology of the Human Sebaceous Gland". Journal of Investigative Dermatology, 30:99-124, 1958.