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Losing muscle and gaining body fat as we get older is pretty common, but it may have consequences that go beyond strength and mobility. In a new study, researchers looked at the connection between muscle loss, excess body fat, and dementia risk and found some interesting differences. They brought together findings from multiple studies to get a better sense of how these factors may be related.
The research suggests that significant muscle loss in middle age could have implications for brain health. They found that sarcopenia, a condition marked by low muscle mass and strength, was associated with a substantially higher risk of dementia.
After combining findings from 83 prospective studies, researchers found that sarcopenia was associated with a higher risk of 42% of developing dementia. For adults under 65, the increased risk was even greater, reaching 48%. The link was even more significant when researchers looked specifically at vascular dementia, which can occur when blood vessel damage affects the brain. People with sarcopenia had a 70% higher risk of developing vascular dementia, according to the analysis.
Muscle does more than help us move. It also communicates with the rest of the body by releasing molecules called myokines when it contracts. As muscle mass and quality decline, these signals may decrease, potentially affecting the brain’s ability to stay healthy and adaptable.
When researchers looked at obesity in adults under 65, they found a modest 9% increase in dementia risk. Interestingly, among adults 65 and older, obesity was associated with a lower risk. This finding doesn’t mean that obesity protects against dementia. BMI doesn’t distinguish well between body fat and muscle, and other factors may affect the results. Researchers suggest that having more body mass could provide extra energy reserves during the early stages of dementia.
The findings suggest that maintaining a healthy body composition may be important for brain health as we age. Taking steps to preserve muscle while keeping excess body fat in check could potentially help lower dementia risk.
To view the original scientific study click below:
Sarcopenia, obesity, sarcopenic obesity and dementia risk: a systematic review and meta-analysis of cohort studies
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