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Middle age weight link to dementia risk

3 May 2011 Last updated at 12:27 BST

Middle aged people who are overweight but not obese are 71% more likely to develop dementia than those with a normal weight, according to research.

A link between obesity and dementia has long been suspected, but according to researchers in Sweden, carrying just a few extra pounds can also have an effect on your brain as you grow older.

Adam Brimelow reports.