Human milk is relatively low in vitamin D, and infants who are exclusively breastfed run a high risk of vitamin D deficiency when they are not also given supplemental vitamin D. Older people who stay indoors compound their potential vitamin D deficiency because they limit sunlight exposure. ![]() As you age, your capacity for producing vitamin D from the sun declines. The more body fat, the less available vitamin D is to the body people with a Body Mass Index of ≥30 may need more vitamin D than non-obese people to obtain optimal blood levels. Ironically, excessive body fat absorbs and holds onto vitamin D, making it unavailable for supporting bone health and its other important functions. Darker skin contains melanin, a compound that blocks the production of vitamin D in response to UVB rays. ![]() …have dark skin, live in areas greater than 20 degrees latitude from the equator, or live in areas with smog and pollution.(This effectively blocks most or all of the UVB rays necessary to begin vitamin D production in the skin.) …cover all exposed skin when outside, or use sunscreen with an SPF of 8 or above. ![]() You may not be getting enough vitamin D if you:
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