1 billion people on our planet are deficient in Vitamin D

Who actually determines the level below which we are “deficient”?

So what if we are deficient? We would see a lot of sick people if it is true that 1 billion people are deficient and if that deficiency presents hazards to our health and well-being.

What changed? Were human beings always deficient or is it a new phenomenon caused by our “way of life” in the 20th and 21st century?

What are the symptoms of deficiency? What are the risks?

And what can we do to remedy the situation?

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