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Obesity can increase dementia risk by up to 80 percent
Date:5/7/2008

Being obese can increase the risk of Alzheimers Disease by as much as 80 per cent, according to a study in the May issue of Obesity Reviews.

But its not just weight gain that poses a risk. People who are underweight also have an elevated risk of dementia, unlike people who are normal weight or overweight.

US researchers carried out a detailed review of 10 international studies published since 1995, covering just over 37,000 people, including 2,534 with various forms of dementia. Subjects were aged between 40 and 80 years when the studies started, with follow-up periods ranging from three to 36 years.

The review, which included studies from the USA, France, Finland, Sweden and Japan, also included a sophisticated meta-analysis of seven of the studies, published between 2003 and 2007 with a follow-up period of at least five years.

All kinds of dementia were included, with specific reference to Alzheimers Disease and to vascular dementia where areas of the brain stop functioning because the blood vessels that supply them are damaged by conditions such as high blood pressure or heart disease.

Our meta-analysis showed that obesity increased the relative risk of dementia, for both sexes, by an average of 42 per cent when compared with normal weight says Dr Youfa Wang, Associate Professor of International Health and Epidemiology at Johns Hopkins Bloomberg School of Public Health, Baltimore.

And being underweight increased the risk by 36 per cent.

But when we looked specifically at Alzheimers Disease, the increased risk posed by obesity was 80 per cent. The increased risk for people with vascular dementia was 73 per cent.

The risks were greater in studies where sufferers developed Alzheimers Disease or vascular dementia before the age of 60 or in studies with follow-up periods of more than 10 years.

We also found that obesity was more likely to be a risk factor for women when it came to
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Contact: Annette Whibley
wizard.media@virgin.net
Wiley-Blackwell
Source:Eurekalert

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