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Jacob Zemer, a New York-based fitness coach who trains clients aged 35 to 55, said preserving lean muscle requires active management as Americans increasingly use GLP-1 medications linked to muscle loss during rapid weight reduction.
He noted that lifestyle shifts contribute significantly to age-related muscle decline.
According to Zemer, adults become more sedentary as they focus on career and family responsibilities, a change that lowers metabolism and activity levels.
He explained that hormone changes beginning in a person's 40s cause the body to partition calories less toward protein synthesis for muscle and more toward fat storage.
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