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Aging frequently comes with a variety of comorbid conditions, among which dementia stands out as particularly daunting, given the difficulties in developing effective treatments. In light of these challenges, focusing on modifiable risk factors that could diminish the risk of this ailment presents a more practical strategy. Obesity has been pinpointed as one such factor.
It appears that obesity in midlife poses a risk for dementia, yet a higher BMI in older age is linked to a lower incidence of the disease. This paradox suggests that BMI might not be the most accurate measure of nutritional health in the elderly, who typically undergo shifts in body composition, including an increase in fat mass alongside a decrease in lean mass, without significant alterations in BMI.
In response, newer studies have shifted focus towards alternative health metrics like waist circumference and waist-to-hip ratio, pointing to the detrimental effects of abdominal fat on cognitive health. Nevertheless, the debate continues regarding the precise impact of different body measurements and fat types on cognitive decline.
This research monitored a cohort of 873 older adults from community settings in Japan. These individuals, all aged 60 years and above and free from cognitive impairments at the outset, were observed biennially over an average span of 9.67 years. The study measured each participant's waist circumference, visceral fat area and subcutaneous fat area. Cognitive function was evaluated using the Mini-Mental State Examination (MMSE). For analysis, these measurements were categorized into three tiers: lowest, middle, and highest.
The analysis revealed that in men, the most significant reductions in MMSE scores were observed in those with the highest measurements of waist circumference, subcutaneous fat area, and visceral fat area, relative to their counterparts in the lowest measurement groups. For women, a similar pattern emerged for waist circumference and subcutaneous fat area, where those in the highest measurement groups experienced the greatest declines in MMSE scores compared to women in the lowest groups. This trend, however, did not hold for the groups categorized by visceral fat area in women.
The team sought to understand their findings by considering existing scientific insights. They suggested that the link between cognitive decline and both visceral and subcutaneous fat might be attributed to the function of adipose tissue as an endocrine entity that produces adipokines. The hypothesis is that abundant abdominal obesity could heighten the release of inflammatory cytokines, potentially leading to cognitive deterioration. This theory is supported by earlier studies, such as one indicating a correlation between elevated levels of the inflammatory cytokine IL-6, an adipokine, and a heightened risk of dementia.
Increased waist circumference (WC), subcutaneous fat area (SFA), and visceral fat area (VFA) in men, along with elevated WC and SFA in women, were linked to more significant cognitive deterioration over the following decade. Yet, no link was found between the accumulation of visceral fat and cognitive decline in women. These results indicate that abdominal fat buildup poses a risk for cognitive decline in the elderly. Additionally, the types of abdominal fat contributing to cognitive decline appear to vary between men and women, highlighting the need for further research to elucidate the sex-specific mechanisms underlying this difference.
To view the original scientific study click below:
Association between abdominal adiposity and cognitive decline in older adults: a 10-year community-based study
For many people, grabbing a hot drink in a disposable cup is part of their daily routine. Yet the container holding your coffee or tea may not be as harmless as it seems. New research suggests the very cup designed to keep your drink hot could also be releasing tiny plastic particles into it.
Not all disposable cups release microplastics at the same rate. Researchers found that the cup material and beverage temperature both affect how many tiny plastic particles leach into a drink. Although microplastics were detected across all temperatures tested, hotter beverages triggered significantly greater particle release.
Measuring less than 5 millimeters, microplastics have emerged as an increasing public health concern. These tiny particles can enter the body through food, beverages, or the air we breathe, where they may build up in organs including the lungs and digestive system and contribute to inflammation and other health problems.
The study combined evidence from previous research with new laboratory testing. Researchers first reviewed 30 published studies, compiling 237 observations to assess how variables such as water temperature and soaking time influenced microplastic release. They then tested two popular types of disposable cups, those made entirely of polyethylene (PE) and paper cups with a polyethylene coating, to compare how much microplastic each released.
Researchers found that hot water caused the surface of polyethylene (PE) cups to become increasingly rough and irregular, a sign of physical degradation that likely contributed to greater microplastic shedding. By comparison, paper cups coated with polyethylene maintained smoother surfaces with less visible damage, which may have helped limit the release of plastic particles.
The study estimated that a single 10-ounce hot beverage consumed each day could add hundreds of thousands of microplastic particles to a person's yearly intake. Drinks served in polyethylene (PE) cups were associated with roughly 360,000 particles per year, while polyethylene-coated paper cups were estimated to release about 240,000 annually.
The healthiest and most environmentally friendly choice is a reusable cup made from stainless steel, glass or ceramic. Because these materials are non-reactive, they won't break down or release chemicals or plastic particles when filled with hot beverages.
Maintaining a healthy weight is becoming increasingly uncommon, with only one in four U.S. adults falling into that category. New research suggests excess weight may be responsible for significantly more cancers than once thought. After analyzing data from more than 450,000 people, researchers estimated that excess body fat is linked to over 11% of all cancer cases, nearly twice earlier estimates.
Being alone isn't necessarily harmful, but feeling lonely may be. According to a new study, older adults who experience persistent loneliness may face a faster decline in both cognitive and physical health. The researchers found that loneliness remained strongly linked to poorer brain health and an increased risk of early death, regardless of how socially isolated a person was.