The connection between vitamin D and depression is not new. In 2006, scientists evaluated the effects of vitamin D on the mental health of 80 elderly patients and found those with the lowest levels of vitamin D were 11 times more prone to be depressed than those who received healthy doses.
In the current study, researchers found that intake of more than 400 IU of vitamin D from food sources was associated with a 20 percent lower risk of depressive symptoms compared with intake of less than 100 IU. This was a significant benefit from a very small amount of vitamin D -- as 400 IU is far too low to benefit most people (not to mention your body is made to get vitamin D primarily from the sun, not food or supplements, as I'll explain below).
It now appears as though most adults need about 8,000 IU's of vitamin D a day in order to get their serum levels above 40 ng/ml, which is the lowest they should be. Ideally your serum levels should be between 50-70 ng/ml, and up to 100 ng/ml to treat cancer and heart disease.
It's likely that vitamin D fights depression via several pathways, not only directly in your brain but also via inflammation. Vitamin D receptors have been identified throughout the human body, and that includes in your brain. Researchers have located metabolic pathways for vitamin D in the hippocampus and cerebellum of the brain, areas that are involved in planning, processing of information, and the formation of new memories.
Sufficient vitamin D is also imperative for proper functioning of your immune system to combat inflammation, and other research has discovered that depressed people tend to have higher levels of inflammation in their brains.
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articles.mercola.com/.../vitamin-d-for-depression.aspx - United States6 Nov 2011 – Treat depression with vitamin D from safe sun exposure instead of using... from food sources had a significantly lower prevalence of depressive symptoms. ...Vitamin D deficiency is associated with increased inflammation in ...