Schizophrenia and vitamin D deficiency

Researchers measured the vitamin D status of 102 psychiatric inpatients in winter in Hamilton, New Zealand. Seventy-three per cent had at least mild deficiency, with levels below 50nM, while 19% were moderate to severely deficient, with levels below 25nM.

Half of the patients were of Maori descent, and they were more likely to have low levels of vitamin D than their European counterparts.

Schizophrenia was associated with markedly lower levels than was mania or depression. Among the 19 patients with severe deficiency, 13 had schizophrenia.