A recent study reveals that the combination of excess abdominal fat and reduced muscle mass considerably heightens mortality risk, emphasizing the importance of early detection.
Researchers from Brazil's Federal University of São Carlos (UFSCar) and University College London (UCL) have highlighted a pressing health concern: the combination of excess abdominal fat and decreased muscle mass significantly elevates the risk of mortality. Their study found that individuals grappling with both conditions could face an 83% increased risk of death compared to those who do not exhibit either condition.
This dangerous interplay is indicative of sarcopenic obesity, a situation marked by declining muscle mass alongside increasing body fat. It's particularly challenging to detect and impacts the personal independence and overall quality of life for older adults. Those affected by this condition may also experience heightened frailty, a greater chance of falls, and various other health complications.
Tiago da Silva Alexandre, a gerontology professor at UFSCar and co-author of the study supported by FAPESP, points out, "We've not only assessed the mortality risk linked to abdominal obesity and low muscle mass, but we've also demonstrated that easy detection methods for sarcopenic obesity exist. The ambiguity surrounding diagnostic criteria complicates effective identification and treatment." These discoveries could facilitate earlier intervention strategies, such as nutritional management and increased physical activity, ultimately fostering improved life quality for older adults.
Published in Aging Clinical and Experimental Research, this research draws on 12 years of data from an extensive cohort of 5,440 participants aged 50 and above, collected through the English Longitudinal Study of Ageing (ELSA).
Typical diagnosis of sarcopenic obesity necessitates advanced imaging techniques like MRI, CT scans, and electrical bioimpedance. These diagnostic methods, while precise in measuring fat and muscle metrics, are costly and not universally accessible, hampering routine evaluations.
However, Alexandre and the team have found that simpler measures, like abdominal circumference and an estimate of lean mass using a clinical equation tailored to individual characteristics, can streamline early detection. "Our study suggests that basic metrics can be used for proactive screening in at-risk populations," Alexandre noted.
The metabolic repercussions of losing muscle while gaining abdominal fat compound the health risks. Valdete Regina Guandalini, a researcher in gerontology at UFSCar and the paper's lead author, explains that individuals exhibiting both conditions face an 83% higher mortality risk. Encouragingly, the data indicated that those with low muscle mass but without abdominal obesity had their mortality risk reduced by 40%, underlining the severe implications of having both conditions present. Intriguingly, individuals with abdominal obesity but sufficient muscle mass did not face any increased mortality risk.
Guandalini elaborates on the biological mechanisms at play, stating, "Excess fat leads to higher inflammation levels within the body, promoting metabolic alterations that accelerate muscle degradation. Each condition exacerbates the other, as fat infiltrates muscle tissue and disrupts its function, undermining essential metabolic, endocrine, and immunological processes."
The absence of a universally accepted definition for sarcopenic obesity has historically hampered identification efforts. The researchers established practical criteria: a waist circumference exceeding 102 centimeters in men and 88 centimeters for women defined abdominal obesity, while low muscle mass was identified as a skeletal muscle mass index lower than 9.36 kg/m2 for men and below 6.73 kg/m2 for women.
These straightforward criteria present the potential for earlier recognition of sarcopenic obesity, enabling more individuals to access critical interventions aimed at mitigating risk and fostering better long-term health outcomes.
Materials provided by Fundação de Amparo à Pesquisa do Estado de São Paulo. Original written by Maria Fernanda Ziegler. Note: Content may be edited for style and length.
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