Higher BMI linked to faster decline in 8,200 adults — SkimNews
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- University of Georgia researchers analyzed data from a nationally representative study tracking more than 8,200 adults over age 50 for 24 years.
- Higher BMI was associated with faster declines in memory, overall cognitive performance and executive functioning, with each one-point BMI increase corresponding to a faster decline rate.
- Participants over 65 showed the most pronounced association, which was strongest at the study's eighth year.
- Suhang Song said that if people managed their weight, "they could significantly lower their rate of cognitive decline in just two years," calling BMI one of the most easily modifiable risk factors for aging well.
- Inflammation, impaired blood circulation and insulin resistance were proposed as processes that together can increase the likelihood of cognitive impairment, Alzheimer's disease and other forms of dementia.
- The study did not establish that excess weight directly causes cognitive decline, but its authors framed weight management as a potentially important factor in maintaining brain health.
- Centers for Disease Control and Prevention estimated that about two in five Americans met the obesity criterion when BMI was the sole measure; broader definitions cited in the article raise the prevalence estimate to 75%.
Why it matters: For adults over 65 and the more than 7 million Americans living with dementia, the findings make weight management a concrete target for preserving cognition. The analysis links weight management to significantly slower cognitive decline within two years, but establishes association rather than causation.
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