Walking 'could ward off dementia and mental decline'

Elderly people who get about by walking are less likely to suffer mental decline or even dementia, a study says.

Brain scans revealed that older people walking between six and nine miles a week appeared to have more brain tissue in key areas.

The Pittsburgh University study of 299 people suggested they had less "brain shrinkage", which is linked to memory problems.

The research was reported in the journal Neurology.

The volunteers, who had an average age of 78, were checked for signs of "cognitive impairment" or even dementia.

The Pittsburgh team also had access to brain scan results from four years previously which measured the amount of "grey matter" in their brains.