6. Depression Response
Akin to lowered immunity, vitamin D deficiency has long been linked to depression. A study published by the British Journal of Psychiatry reports that inadequate levels of vitamin D in the bloodstream will double the chances of a depression diagnosis.
After monitoring more than 31,000 study subjects, researchers noted a drastic loss of function in the hippocampus area of the brain (which harbors vitamin D receptors and helps regulate mood) due to low vitamin D levels compared to study participants with healthy vitamin D levels.