06 Aug 2018 --- A higher waist to hip ratio has been linked to reduced cognitive function in older Irish adults (over 60 years of age) by a new study using data from over 5,000 individuals. These findings have significant implications as the global prevalence of dementia is predicted to increase from 24.3 million in 2001 to 81.1 million by 2040.
Previous studies have found that people who are overweight do not perform as well on tests of memory and visuospatial ability compared to those who are of normal weight. However, it is not well known if this is true in older adults. This is of concern within Ireland, as over half of the over 50s population is classified as being centrally obese, with only 16 percent of men and 26 percent of women reported having a BMI (body mass index) within the normal range.
The researchers used data from the Trinity Ulster Department of Agriculture (TUDA) aging cohort study comprising, which is a cross-border collaborative research project gathering data from thousands of elderly adults in Northern Ireland and Ireland.
The researchers found that a higher waist to hip ratio was associated with reduced cognitive function. This could be explained by an increased secretion of inflammatory markers by belly fat, which has been previously associated with a higher risk of impaired cognition. On the contrary, body mass index (BMI) was found to protect cognitive function. BMI is a crude measure of body fat and cannot differentiate between fat and fat-free mass (muscle), thus it is proposed that the fat-free mass component is likely to be the protective factor.
Given the high prevalence of overweight and obesity in the older population and the economic and social burden of cognitive dysfunction, the results suggest that reducing obesity and exposure to obesogenic risk factors could offer a cost-effective public health strategy for the prevention of cognitive decline.
“While we have known for some time that obesity is associated with negative health consequences our study adds to emerging evidence suggesting that obesity and where we deposit our excess weight could influence our brain health. This has significant public health implications,” says lead author, Conal Cunningham, Clinical Associate Professor in Medical Gerontology at Trinity.
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