Q

Sun Care

How does UVB radiation activate vitamin D?

A Answers (1)

  • A , Cardiology (Cardiovascular Disease), answered
    UVB activates vitamin D through cholesterol. That's why your blood cholesterol levels rise in the winter. Because of the lack of sunlight, you don't have enough active vitamin D in winter, so your body pumps up your cholesterol in the hope of converting as much as possible to active vitamin D.

    This serves as another example of an evolutionary trade-off between procreation and longevity. To protect us from deficiencies of vitamin D, we've evolved to have higher levels of cholesterol. So now we survive to mate and to be able to stand up strong and look good—only to be felled by high LDL cholesterol and consequent heart disease and stroke.
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