You did use the expression "sun burns" so don't blame me for interpreting it that way. It makes sense evolutionarily? Most hunter gatherers outside the tropics are not exposed to sunlight anyway that would result in damage to the epidermis(is this what you are implying), and in most of the rest of the year they don't get enough sun exposure to develop tans anyway even if they stay out all day long. It wouldn't make sense that vitamin D could only be synthesized by enough sun exposure that would require burns. In fact, Nothern Europeans developed white skin so as to maximize vitamin D production since white skin absorbs maximum sun rays. And getting sun burns is something that we are discouraged both physiologically as well as psychologically. Most people avoid midday sun and get cover. If getting sun burs is required for vitamin D production, then why are we discouraged from staying out in the sun by our own bodies? We get nausea, headaches and painful skin burns if we stay out in the Sun for long. How does this make sense evolutionarilly?
Have you checked Canada's latitude? Of course you probably do need vitamin D in Canada. I don't think people in the tropics or subtropical regions require vitamin D supplementation at all. I live in a subtropical region and I have never developed a vitamin D deficiency even though I don't get sunlight nor drink milk and I don't know anyone either lolll.
SUCKMYMUSCLE
You did use the expression "sun burns" so don't blame me for interpreting it that way. It makes sense evolutionarily? Most hunter gatherers outside the tropics are not exposed to sunlight anyway that would result in damage to the epidermis(is this what you are implying), and in most of the rest of the year they don't get enough sun exposure to develop tans anyway even if they stay out all day long. It wouldn't make sense that vitamin D could only be synthesized by enough sun exposure that would require burns
Your first sentence is pure conjecture, hunter gatherers were outside a 1000% more the we are now, the vast majority of all activities are done inside now.. In fact, Nothern Europeans developed white skin so as to maximize vitamin D production since white skin absorbs maximum sun rays. And getting sun burns is something that we are discouraged both physiologically as well as psychologically. Most people avoid midday sun and get cover. If getting sun burs is required for vitamin D production, then why are we discouraged from staying out in the sun by our own bodies? We get nausea, headaches and painful skin burns if we stay out in the Sun for long. How does this make sense evolutionarilly?
i already corrected or clarified myself, sun damage.accumulation over time. It makes perfect sense, the body is a shitty machine, why do we lack the enzyme to synthesize vitamin c? doesnt seem efficient, evolution is not directed.
So previously we spent almost all our time outdoors, in fact the vast majority. This would dictate that the vitamin d conversion would be slow, otherwise it would get toxic fast. Thus, now we get a couple hours max and the process is still the same slow process. Add in the longevity we now live with and things like cancer become a factor, where as cancer is not a big of a concern if you die at 30. Anyway, there is data to back this up, a pretty new study in fact. Ill post it tom.