Low levels of vitamin D have been linked to depression in the largest investigation of its kind. Researchers at UT Southwestern Medical Centre confirmed that vitamin D has an effect on depression, particularly among those with a history of the condition, after smaller studies produced conflicting results. Dr E Sherwood Brown, senior author of the study, commented: "Our findings suggest that screening for vitamin D levels in depressed patients – and perhaps screening for depression in people with low vitamin D levels – might be useful. "But we don't have enough information yet to recommend going out and taking supplements." Vitamin D is believed to affect neurotransmitters, inflammatory markers and other factors, which could help explain the relationship with depression. Low levels of vitamin D are already associated with a myriad of health complaints, including cardiovascular disease and neurological complications. However, excessive vitamin is thought to cause the onset of atrial fibrillation. Read about support and personalised care at Barchester care homes for anyone with mental health concerns.