Exercise now to cut dementia risk

"Exercising for half an hour at least twice a week during midlife can significantly cut a person's risk of dementia later, say researchers.

People in their late 40s and early 50s who do this could reduce their risk of dementia by about 50%, according to a study reported in Lancet Neurology.

Those who are genetically prone to Alzheimer's disease could see a reduction of about 60%, it adds.

The Swedish team said the findings had large disease prevention implications.

'If an individual adopts an active lifestyle in youth and at midlife, this may increase their probability of enjoying both physically and cognitively vital years in later life,' they said."

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