Also note that because vitamin D is formed from cholesterol in the skin
So, one could conclude then that a high fat diet + lots of sun exposure + irregular showering (or maybe showering only using water rather than with soaps) will help increase one's vitamin D production.
asked byPhillip_B_Oldham (267)
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on August 25, 2010
at 06:57 PM
Dogs lick and groom each other and themselves -- but most primates do not and I think we have lost the vitamin D production that increases levels in sebum. I haven't come across any evidence that showering (immediately) removes vitamin D topically... Vitamin D is synthesized in the skin but is likely immediately shunted into the capillaries into the blood supply.
I've personally increased my cholesterol intake -- bacon egg yolks A LOT and my vitamin D levels stayed the same I've noticed. The only thing that changes the vit D is sunlight (but I'm a tan asian) and taking supplements.
The funny thing about statins (which are evil) are that by blocking HMGCoA, there may be a 'backlog' of cholesterol precursor and this raises vitamin D levels significantly probably secondary to some feedback loop. Many (incl me) , which is potently anti-inflammatory.
on August 25, 2010
at 08:43 AM
Dietary Cholesterol has zero to no influence of serum cholesterol in your body so, eating high fat diet (although good!) would not help in Vitamin D production (in the way you are thinking).
Sun exposure through the peak periods (10am-2pm) will increase your production of Vitamin D. How much, is a point of debate, and depends on numerous factors. Skin color, geographical position etc. etc.
It is thought that washing does remove Vitamin D, however even just washing with water is said to remove the Vitamin D rich oils produced.
Unless you live in an equatorial climate and sunbake at least once a week, chances are you won't be able to produce enough Vitamin D. The best way is to supplement and get your Vitamin D checked on a yearly basis.
on August 26, 2010
at 04:54 AM
Studies have shown that human sebum has a high level of vitamin D in it. Studies also show that vit D reabsorbs effectively through skin. Sooooooo, this is a strong suggestion that human sebum may have a role in vitamin D acquisition. And if you think about it, this makes tons of sense. What it would mean is you can be dark skinned or heavily tanned, and the body can send the sebum/cholesterol out past the dark skin, let it get nuked by the sun and produce D, and then reabsorb it. After all, it can take weeks or months for some people to diminish a heavy summer tan. What if the weather changed rapidly and it suddenly became overcast? Your body would suddenly find it harder to produce D.
This skin oil system would probably already have been in place in our hairy ancestors in order to get past the fur, same as how it works in dogs and cats. If it still had a good use after fur levels lessened, then it would probably still be preserved in modern humans. Ironically, I was reading in some sources that dark skinned people tend to have more oily skin than light skinned people. Also, strong sun tends to cause increased sebum production. Coincidence? Maybe not!