Scientists evaluated the effects of vitamin D on the mental health of 80 elderly patients, half of whom were stricken with a mild case of Alzheimer's disease and the rest of whom had no problems with dementia.
The patients were evaluated using a battery of standard tests. Those with the lowest levels of vitamin D were 11 times more prone to be depressed than those who received healthy doses. Moreover, 58 percent of patients had abnormally lower vitamin D levels than the mean.
Vitamin D deficiency is common in older adults, and has previously been implicated in both psychiatric and neurological disorders.