Weekly Health Quiz: Viral Shedding and Exercise

1 Which of the following is a major risk factor for vitamin D deficiency and severe COVID-19?

  • High melanin density (darker skin)

    Darker skin requires far more sun exposure to produce adequate vitamin D, so much so that dark-skinned individuals living north of the equator are virtually guaranteed to be chronically deficient, which also increases their risk of severe COVID-19 illness and death. Learn more.

  • Low melanin density (lighter skin)
  • Low body weight
  • Being under the age of 20

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