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a lot of factors affect the ability of your skin to make vitamin D upon Sun production when you hit UVB radiation sunscreen dark skin color high body fat and old age all affect the ability of your body to produce vitamin D
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there are a few factors that affect the ability of our body to produce and use vitamin D first is sunscreen sunscreen blocks UVB radiation second is skin pigmentation melanin is a natural sunscreen third is age as we age our body becomes less efficient at producing vitamin D such that a 70 year old produces four times less vitamin D than a twenty year old and last is body fat body fat actually affects the ability of our body to use vitamin D by reducing the bioavailability of vitamin D which is fat soluble
sunscreen dark skin color high body fat and age all affect the ability of your body to produce vitamin D
So, anything that blocks out UVB radiation is also going to block out the ability to produce vitamin D3 in our skin. That includes sunscreen. It also includes skin pigmentation. So melanin, this is this is the darker pigmentation that serves as a natural sunscreen that also blunts the body's ability to make vitamin D3 from UVB radiation. Age. As you get older, your body is less efficient and effective at producing vitamin D3 from sun exposure. In fact, a 70-year-old makes four times less vitamin D from the sun than a 20-year-old where you live. So living in a northern latitude many months of the year actually there's no UVB radiation even reaching the atmosphere. So people that are living in more northern latitude areas are not able to make vitamin D3 in their skin from the sun for many many months of the year. So that also really affects the ability to make vitamin D. And then also just body fat. So vitamin D is actually a fat soluble vitamin and it's stored in fat. And so the more body fat that you have, that means the less vitamin D3 is bioavailable to be released into the bloodstream where that it undergoes further metabolic conversion to the steroid hormone, which is actually what's regulating all these genes, many of them in the brain.
So that means sunscreen. It means melanin. That's the dark pigmentation that is protects us from the burning rays of the sun. It also means depending on where we live and the time of year. So more northern latitudes at certain times of the year UVB rays are not even reaching the atmosphere. So if you're in a more northern latitude then you know 5 months out of the year you're not even getting that UVB radiation. And then there's also age. As you get older you're less able to make as much vitamin D3 from UVB radiation. And so that's a factor. And then also um body fat is another factor.