Lack of sun ;...: There are many possible causes of anemia- see https://www.Nhlbi.Nih.Gov/health/health-topics/topics/anemia/causes.Html vit d deficiency occurs in almost everyone who does not take enough in fall ; winter when the sun isn't high enough to allow us to produce d (unless you live in the tropics). Adults need 5000-8000 iu/day of d3 for optimal levels. See http://bit.Ly/1dc7vna ; http://bit.Ly/166dliq.
Answered 4/14/2016
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