Dementia and stroke risk linked to lack of vitamin D as supplements 'may be needed'

There is a direct link between vitamin D deficiency and the risk of dementia, according to a new study.

Alzheimer's disease is a form of dementia, which refers to a group of symptoms affecting memory, thinking and language for which there is no cure.

Researchers at the University of South Australia have found that vitamin D deficiency can lead to dementia.