Vitamin D supplements 'advised for everyone'
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Sure.
Melanin prevents the absorption of UV-B light unless its between 10-3PM outdoors in most of North America. Vitamin D deficiency is more common in blacks BECAUSE north of the 33rd Parallel most of the sun is out for shorter parts of the day. If you live south the 33rd parallel, you're less likely to have a deficiency.
The most prominent guy who researched this is this guy. I've met him as well.
Michael F. Holick - Wikipedia, the free encyclopedia
He specifically studied black populations and vitamins D
How A Vitamin D Test Misdiagnosed African-Americans
I don't know, but from my knowledge, magnesium is important for bones, so it probably deals with magnesium in a different way.
I look at it like this, Vitamin d is a hormone that helps with the absorption of minerals that effect bone, so in essence it is a stimulant to that part of our body. It makes sense because vitamin d is made from the sun, something that is always available, so as long as we eat the leafy vegetables, and their stems, OUR form of "stems" which is our bones, will always have an ample supply of whats needed for strong bones. Think about it, if your bones go, ain't shyt happening, so that is the FIRST thing that is important to the body, and nature makes sure we have what's needed for strong bones to be had. All we have to do is eat enough carbs to make sure some fat is made. Then this fat, which is saturated, gets converted to cholesterol, and then that gets metabolized along with the uvb light, and now vitamin d is made. The more uvb the skin can hold onto, the more vitamin d. Guess which color holds more uvb? You know the answer to that.
The thing is because dark skin "holds" onto uvb effectively, it will slowly be used the system to make vitamind, whereas the lighter you are, the uvb can go more quickly to the base of the skin, and make vitamin d. The problem is that means much higher chance of getting skin cancer because there is nothing to stop the uvb from being so radical. In essence the darker you are, the slower, and longer you make vitamin d, and the lighter you are the quicker, but you also have a higher chance of getting skin cancer. They can still prevent skin cancer if they eat a diet high in antioxidants that are fat soluble. Hopefully you get what I'm trying to convey.
Ok, now we disagree on this.
Melanin doesn't prevent absorption of uvb, it scatters the light, as well as some absorption, so that its not harmful.
Also, that second article actually proved blacks weren't low in the active form of vitamin d, it was the protein that holds vitamin d that we were low in.
Articles on melanin, and light:
The Protective Role of Melanin Against UV Damage in Human Skin
"Epidemiological data strongly support the photoprotective role of melanin as there exists an inverse correlation between skin pigmentation and the incidence of sun-induced skin cancers (1) and subjects with White skin are approximately 70 times more likely to develop skin cancer than subjects with Black skin (67). The shielding effect of melanin, especially eumelanin, is achieved by its ability to serve as a physical barrier that scatters UVR, and as an absorbent filter that reduces the penetration of UV through the epidermis (68). The efficacy of melanin as a sunscreen was assumed to be about 1.5-2.0 sun protective factors (SPF); possibly as high as 4 SFP, implying that melanin absorbs 50% to 75% of UVR. An SPF of 2 means the doubling of protection of the skin against sunburn. Dark skin, which contains more eumelanin than fair skin is better protected against UV-induced damage, and eumelanin is thought to be superior to pheomelanin in its photoprotective properties. As discussed by Gloster and Neal (69) melanin in Black skin is twice as effective compared to White skin (70) in inhibiting UVB radiation from penetrating. While Black epidermis allows only 7.4% of UVB and 17.5% of UVA to penetrate, 24% UVB and 55% UVA passes through White skin (70)."
Humans | Causes of Color
"Melanin reduces ultraviolet induced DNA damage by absorbing or scattering the ultraviolet radiation that otherwise would have been absorbed by the DNA. This prevents the development of melanoma, a potentially deadly form of skin cancer, as well as other health problems related to exposure to strong solar radiation. The amount of UV radiation that is absorbed or scattered is determined by a number of factors: the size, shape, and distribution of melanosomes, as well as the wavelength of the incident ray."
Why eumelanin is such a good absorber of light
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Bruh.
I've MET the man. I've been in his fukking lab. I know people he works with.
He knows WTF he's talking about.
Listen to me.
Melanin PREVENTS the production of Vitamin D in darker skinned people.
The same way it prevents UV damage, it prevents the vitamin D precursors from getting the right wavelength of light to generate endogenous vitamin d
@lotty
Humans evolved at the equator. They were constantly exposed to sunlight and developed an efficient natural sunscreen melanin,49 which has an absorption spectrum of 290–700 nm and thus can effectively absorb solar UVB radiation (Fig. 32).45 However even though Africans have extremely dark heavily pigmented skin a small amount of UVB radiation is able to penetrate into the epidermis to produce vitamin D3. This was demonstrated when adult whites (skin type 2) and blacks (skin type 5) were exposed to the same amount of UVB radiation in a tanning bed. Whereas the white adults raised their blood levels of vitamin D3 more than 30 fold the black adults demonstrated no significant increase in their blood levels of vitamin D3. However when the black adults were exposed to 5 times more UVB radiation, they increased their blood level by about 15-fold (Fig. 33).50 This was confirmed when surgically obtained white and black skin was exposed to sunlight in Boston in summer. After 30 min approximately 3% of cutaneous 7-dehydrocholesterol was converted to previtamin D3 in the white skin sample whereas only about 0.3% of 7-dehydrocholesterol was converted to previtamin D3 in the black skin (Fig. 34).51 These findings could explain the positive association between skin lightness and 25-hydroxyvitamin D [25(OH)D] levels as found by Armas et al.52 (Fig. 35). The associations between skin lightness, UVB dose and 25(OH)D are documented in Figure 36.
Sunlight and Vitamin D: A global perspective for health
Come on bro...I do this shyt for a living.
I referred you to the dude who is one of the foremost experts in vitamin D research.
Humans evolved at the equator. They were constantly exposed to sunlight and developed an efficient natural sunscreen melanin,49 which has an absorption spectrum of 290–700 nm and thus can effectively absorb solar UVB radiation (Fig. 32).45 However even though Africans have extremely dark heavily pigmented skin a small amount of UVB radiation is able to penetrate into the epidermis to produce vitamin D3. This was demonstrated when adult whites (skin type 2) and blacks (skin type 5) were exposed to the same amount of UVB radiation in a tanning bed. Whereas the white adults raised their blood levels of vitamin D3 more than 30 fold the black adults demonstrated no significant increase in their blood levels of vitamin D3. However when the black adults were exposed to 5 times more UVB radiation, they increased their blood level by about 15-fold (Fig. 33).50 This was confirmed when surgically obtained white and black skin was exposed to sunlight in Boston in summer. After 30 min approximately 3% of cutaneous 7-dehydrocholesterol was converted to previtamin D3 in the white skin sample whereas only about 0.3% of 7-dehydrocholesterol was converted to previtamin D3 in the black skin (Fig. 34).51 These findings could explain the positive association between skin lightness and 25-hydroxyvitamin D [25(OH)D] levels as found by Armas et al.52 (Fig. 35). The associations between skin lightness, UVB dose and 25(OH)D are documented in Figure 36.
Sunlight and Vitamin D: A global perspective for health
Come on bro...I do this shyt for a living.
I referred you to the dude who is one of the foremost experts in vitamin D research.
My man, he is not the creator of vitamin d or uvb, he just studied vitamin d, don't put him higher then he is.
How melanin functions is in agreement with most in the science field. I just gave you links from actual studies, it isn't just me saying this.
Also, you need to read on eumelanin and how it is highly effective at absorbing a broad spectrum of light. In other words, at different times of the day, you will have different wavelengths that will hit the skin, but because eumelanin is so good at absorbing all these spectrums, you will still absorb the short wavelength of uvb even when it isn't being released at its peak at noon.
Read the last article I linked if you are serious. Its a recently new find(2014)
Read my previous post explaining why this is happening. It makes sense when you are just looking at things with a simple mind, but once you understand how the body works, it makes sense that the levels were low for blacks.
This is the quote from the above post, and your post just proved me right:
"The thing is because dark skin "holds" onto uvb effectively, it will slowly be used the system to make vitamind, whereas the lighter you are, the uvb can go more quickly to the base of the skin, and make vitamin d. The problem is that means much higher chance of getting skin cancer because there is nothing to stop the uvb from being so radical. In essence the darker you are, the slower, and longer you make vitamin d, and the lighter you are the quicker, but you also have a higher chance of getting skin cancer. They can still prevent skin cancer if they eat a diet high in antioxidants that are fat soluble. Hopefully you get what I'm trying to convey."
This is false. I KNOW how the body works. I literally got my degree (masters) in this.
Vitamin D deficiency is higher in black americans.
Go talk to physicians. If you know any on a personal basis.
Again, this is wrong.
Vitamin D via UVB absorption takes more time in black people.
Period.
This is why D3 levels are lower in black people.
Period.
Go get a blood test read out, then read about why D3 tests for blacks were historically overestimated because the sheer amount of melanin always never got calculated for black patients until recently
@lotty I don't know why you're debating a professional who LITERALLY studied this for years and you didn't. I even introduced you to the GLOBAL EXPERT on vitamin D.
Come on man. I'm a black male. I know this shyt like the back of my hand.
Go read the melanoma rates for black people who live north of the 36th parallel. Its astronomical.
Come on man. I'm a black male. I know this shyt like the back of my hand.
Go read the melanoma rates for black people who live north of the 36th parallel. Its astronomical.
@ThreeLetterAgency
You have not proven anything yet, you just keep saying you met the guy who started the studying of vitamin d, not sunlight, and its effect on the skin, and that you do this for a living. Come on man, if you are in a debate, you back up what you stand on with facts.
Also, you linked TWO articles that helped prove my points, so I'm getting confused now. The argument is done, ok?
That was quick
You have not proven anything yet, you just keep saying you met the guy who started the studying of vitamin d, not sunlight, and its effect on the skin, and that you do this for a living. Come on man, if you are in a debate, you back up what you stand on with facts.
Also, you linked TWO articles that helped prove my points, so I'm getting confused now. The argument is done, ok?
That was quick
All I asked you do was to prove your point, like I did, but you didn't, and you actually helped prove MY points!
Peace
Your interpretation of said articles, is wrong.@ThreeLetterAgency
You have not proven anything yet, you just keep saying you met the guy who started the studying of vitamin d, not sunlight, and its effect on the skin, and that you do this for a living. Come on man, if you are in a debate, you back up what you stand on with facts.
Also, you linked TWO articles that helped prove my points, so I'm getting confused now. The argument is done, ok?
That was quick
The point is simple:
1. Black people are vitamin D DEFICIENT en masse
2. More UVB exposure is needed for blacks to produce endogenous D3.
3. I dont want to start dropping unnecessary credentials on here, but its clear you aren't aware of where you're wrong about this stuff because you haven't the slightest clue of how this works.
lets listen to a REAL doctor..instead of low information militants
@lotty you need to listen to this.