Multiple news sources reported a systematic review of 10 published studies in 5 different countries that found obesity increases the risk of dementia in general by 42% and Alzheimer's by 80%. Researchers also found that people who are underweight have an elevated risk of dementia and its subtype. The study also included a meta-analysis of 7 stuides with at least 5 years followed up.
The senior author said that preventing obesity at a younger age could reduce the number of dementia patients in the US.
Source: "Obesity and central obesity as risk factors for incident dementia and its subtypes: a systematic review and meta-analysis". Obesity Reviews 9(3):204-218, May 2008
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