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A deficiency occurs if a person doesn't get enough vitamin D from sunlight or food, or if their body can't synthesize or absorb vitamin D properly due to an underlying condition or medication.
Most people associate vitamin D with sunlight, but it’s possible to get the nutrient from food and supplements, too. That’s good news, given that vitamin D deficiency is common around the world.
Older adults, whose bodies become less good at making vitamin D from sun exposure as they age; Folks with dark skin (your body may make less vitamin D from the sun); People carrying a lot of ...
Decreased exposure of the skin to sunlight is a common cause of vitamin D deficiency. [1] People with a darker skin pigment with increased amounts of melanin may have decreased production of vitamin D. [3] Melanin absorbs ultraviolet B radiation from the sun and reduces vitamin D production. [3] Sunscreen can also reduce vitamin D production. [3]
Cholecalciferol, also known as vitamin D 3 or colecalciferol, is a type of vitamin D that is produced by the skin when exposed to UVB light; it is found in certain foods and can be taken as a dietary supplement. [3] Cholecalciferol is synthesised in the skin following sunlight exposure. [4]
Most people in the world depend on the sun to get vitamin D, [31] and elderly populations in low UVB countries experience higher rates of cancer. [32] There are not many foods that naturally have vitamin D. [33] Examples are cod liver oil and oily fish. If people cannot get sunlight, then they will need 1,000 IU of vitamin D per day to stay ...
Ordon reiterates that direct sun exposure — a.k.a. being outside in the sun — can help the body produce enough vitamin D, but for the vast majority of people in the U.S., this is only possible ...
People diagnosed with schizophrenia tend to have lower serum vitamin D concentrations compared to those without the condition. This may be a consequence of the disease rather than a cause, due, for example, to low dietary vitamin D and less time spent exposed to sunlight. [151] [152] Results from supplementation trials have been inconclusive. [151]