The potential of vitamin D in fighting off the symptoms of dementia has been further proven, according to new research.
The nutrient may improve brain function, researchers believe, after tests on middle-aged and older men showed that those with higher levels of vitamin D in their blood had better cognitive function than men with low amounts.
Faster information processing and better memory were found in men with higher vitamin D levels, although it is thought that information processing could be also be linked to activity level and mood.
The study found that those who performed poorly were men who had vitamin D levels of 35 nanomoles per litre or less in their blood.
The research was conducted at eight test centres around Europe on 3,133 men aged between 40 and 79 and was published in the Journal of Neurology, Neurosurgery and Psychiatry.
Dr David Lee from Manchester's School of Translation Medicine, the paper's lead author, said: "The main strengths of our study are that it is based on a large population sample and took into account potential interfering factors, such as depression, season and levels of physical activity."
The Alzheimer's Society believes that over a million people in the UK will suffer from dementia by 2025.