As reported on the BBC News on 3rd May 2011, there is a link between being overweight and dementia. The study says 1.6 billion adults are overweight worldwide. While previous studies have indicated a link between obesity and dementia, a new study of 8,534 of Swedish twins, in the journal Neurology, suggests just being overweight is also a risk factor.
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Those with a body mass index (BMI) - which measures weight relative to height - greater than 30, who are classified as obese, were 288% more likely to develop dementia than those with a BMI between 20 and 25, according to the study. The clinically overweight, who have a BMI between 25 and 30, were 71% more likely to get dementia.
Weili Xu et al., Mid- and Late-Life Diabetes in Relation to the Risk of Dementia A Population-Based Twin Study., Diabetes. 2009 January; 58(1): 71–77.