In the world about 1 billion people have vitamin D deficiency. About 50% of people have vitamin D insufficiency. What is one of the main causes?
When people use 30 SPF or higher, you are blocking 90% of your vitamin D absorption. In essence, if you lather a whole bunch of sunscreen on you are really not going to get much vitamin D at all. For those who have darker skin, you will have to be out in the sun 3-5 times longer than someone who is lighter to get your full absorption of Vitamin D. Another factor is to get the full absorption, you have to expose 40-60% of your skin. A factor that a lot of Americans deal with unfortunately is obesity. With obesity, it limits your ability to fully absorb vitamin D. Now with all those factors, you can see why there are so many people suffering from vitamin D deficiency.
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