What is the connection between vitamin D and depression?

The exact connection between vitamin D and depression is not fully understood. There seems to be a correlation between these two, not a direct causal connection. It has been found that people with clinical depression have vitamin D deficiencies, although it could be symptoms of a different root cause. A seasonal affective disorder (SAD) is a condition that is assumed to be associated with decreasing the exposure of bright light in the winter months, and the lack of sunlight can also create a lack of vitamin D. Research suggests that there may be a causal relationship between vitamin D and depression.

It seems that there is a connection between vitamin D and depression. The human body is able to synthesize vitamin D if sufficient sunlight is available, so the deficiency is usually associated with a lack of natural light or defective species. Lack of sunlight may also cause depression symptoms in some people, as can be seen in seasonal affective disorders. It is believed that the lack of sunlight has a negative impact on the brain chemistry, although it is also possible that low levels of vitamin D production could contribute to this disorder and other forms of depression.

The human body depends on the type of light known as ultraviolet-B (UVB) to produce vitamin D. The study and unofficial evidence suggest that UV filters light therapy can improve mood, indicating that conditions such as SAD are not entirely caused by vitamin D deficiency or improved its presence. However, other studies suggest that vitamin D may have a similar or free effect on mood. One study with a double blind conducted in Australia suggested a causal relationship between vitamin D and depression. This study included the administration of vitamin D _{3 and found positive results one standard deviation over placebo.}

unofficial evidence also in the NAZNAlthough the relationship between vitamin D and depression. Increased depression in recent history has coincided with a number of trends that reduced human exposure to sunlight, especially UVB necessary for the production of vitamin D. Urbanization and time spent inside, especially in a closed office environment, can dramatically reduce the exposure of sunlight. The potentially harmful effects of ultraviolet radiation also led to the wide use of sunscreen, which may have an unintended effect of decreased vitamin D production. None of this does not necessarily show that low levels of vitamin D cause depression, even if a strong relationship can be seen.