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2 September 2015, 07:15
Almost two-thirds of Britons are unaware that exercise can help cut the risk of dementia.
A survey for the Alzheimer's Society found 64% are unaware of the benefits of regular exercise while 14% do not do any exercise.
The NHS recommends that adults should exercise at moderate intensity - such as brisk walking or cycling - for at least 150 minutes a week.
Just 18% of people surveyed said they followed the guidelines.
Some 19% of people said they did less than 30 minutes of exercise a week.
Clare Walton, research manager at the Alzheimer's Society, said: "What's good for the heart is good for the head and regular exercise is one of the best ways to reduce your risk of developing dementia, yet many people questioned didn't know that.
"People living with dementia should also try to keep physically active as it can bring many benefits including improved circulation, reduced stress and anxiety and better sleep.''
Of more than 5,000 people surveyed, 85% said they knew exercise could improve overall fitness and help maintain a healthy lifestyle.
Some 78% said they thought regular exercise had a significant impact on weight loss while 70% knew it reduced the risk of heart disease.
Meanwhile, 58% were aware exercise could reduce the likelihood of developing Type 2 diabetes.
About 850,000 people in the UK have dementia, according to the Alzheimer's Society.
Dementia costs the UK economy more than £26 billion per year.