Who is at risk for vitamin D deficiencies?
People who have less ability to convert the vitamin to its active form have a higher risk of deficiency. For example, living very far north of the equator means you get less exposure to sunlight, putting you at higher risk. People who have thinner skin also have a higher risk, as do people who constantly cover their skin with long-sleeved clothes or sunscreen. Spending most of your time indoors can also increase risk. Darker colored skin, pregnancy, and obesity are also risk factors for this deficiency.