Sarcopenia: Causes of Muscle Loss and Solutions
Sarcopenia is the age-related loss of skeletal muscle mass, strength, and physical performance. It becomes more common with aging, but muscle loss can also occur earlier because of inactivity, inadequate nutrition, illness, or certain medications.
Common causes
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Aging: Muscle protein synthesis becomes less responsive to dietary protein and exercise, while hormonal and cellular changes contribute to muscle loss.
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Physical inactivity: Bed rest, prolonged sitting, hospitalization, or avoiding resistance exercise can cause relatively rapid declines in muscle strength and size.
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Insufficient protein or calories: Low protein intake, poor appetite, restrictive diets, or unintentional weight loss can accelerate muscle loss.
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Chronic diseases: Conditions affecting the heart, lungs, kidneys, liver, nervous system, or metabolism can contribute to muscle wasting.
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Inflammation and hormonal changes: Chronic inflammation and age-related changes in hormones such as testosterone, estrogen, and growth-related hormones can play a role.
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Vitamin D deficiency: Low vitamin D is associated with poorer muscle function, although correcting it alone isn’t a substitute for exercise and adequate nutrition.
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Medications and other factors: Some medications and prolonged illness can contribute to weakness or muscle wasting.
What actually helps?
1. Resistance training — the cornerstone
Strength training is the most important intervention for maintaining or rebuilding muscle.
Aim for 2–3 sessions per week, covering major muscle groups. Examples include:
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Squats or sit-to-stand exercises
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Lunges or step-ups
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Rows
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Chest presses or push-ups
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Overhead presses
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Hip hinges/deadlifts
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Calf raises
Start with a manageable resistance and gradually increase the load or repetitions as strength improves
