Weight-loss medications like semaglutide are celebrated for their fat-burning effects, but new research shows they may also reduce muscle mass. Here are the key findings and what you can do to protect your strength.
Muscle makes up 40% of your body
In healthy adults, nearly half of total body weight comes from muscle, which is crucial for movement, metabolism, and overall health. Losing too much of it can tip the balance toward frailty.
Obesity changes muscle fiber type
Excess weight shifts muscle composition away from efficient, fat-burning fibers toward less efficient ones, making energy use harder and fatigue more common.
GLP-1 drugs help with weight loss
Medications like semaglutide and liraglutide improve insulin function, reduce appetite, and lower fat mass, making them highly effective for obesity and type 2 diabetes treatment.
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But muscle loss is part of the package
Alongside fat loss, these drugs also reduce lean mass, including skeletal muscle, raising concerns about long-term strength and mobility.
Women may be more affected
Studies show women often lose more total weight with GLP-1s, but this also means greater absolute loss of muscle compared to men.
Muscle is vital for blood sugar control
Skeletal muscle is the largest site of glucose uptake after meals. Less muscle mass can impair blood sugar regulation, countering some benefits of weight loss.
Exercise can counteract the loss
Resistance training helps stimulate protein synthesis and preserves muscle, making it a key strategy for patients using GLP-1 medications.
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Protein intake matters
Eating enough protein supports muscle repair and growth. Experts recommend prioritizing lean protein sources when on GLP-1 therapy.
New therapies are on the horizon
Drugs like bimagrumab and tirzepatide are being tested for their ability to reduce fat while preserving or even increasing muscle mass.
Smarter clinical monitoring is needed
Future trials should use advanced imaging and physical performance tests to measure not just weight loss, but also muscle quality and function.
Artiklen er baseret på informationer fra News Medical
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