Sarcopenia: Causes of Muscle Loss and What You Can Do
Sarcopenia is the age-related loss of skeletal muscle mass, strength, and physical performance. It becomes more common with aging, but it isn’t simply something you have to accept as inevitable. Resistance exercise and adequate nutrition can help slow, prevent, and in some cases partially reverse muscle loss.
What causes sarcopenia?
Several processes can contribute at the same time:
- Aging: Muscle protein synthesis becomes less responsive to dietary protein and exercise.
- Physical inactivity: Periods of sitting, bed rest, or simply doing less activity can cause muscle to shrink surprisingly quickly.
- Insufficient protein or calories: Not eating enough protein, particularly during illness or weight loss, makes maintaining muscle more difficult.
- Hormonal changes: Age-related changes in hormones such as testosterone, estrogen, and growth-related hormones can influence muscle maintenance.
- Chronic diseases: Conditions affecting the heart, lungs, kidneys, nervous system, or metabolism can contribute to muscle loss.
- Inflammation: Persistent inflammation associated with some diseases and aging can promote muscle breakdown.
- Vitamin D deficiency: Low vitamin D status can be associated with poorer muscle function, although taking vitamin D alone isn’t a guaranteed treatment for sarcopenia.
The most important solution: strength training
Resistance exercise is the cornerstone of preventing and treating sarcopenia.
You don’t necessarily need a gym. Depending on your fitness level, exercises can include:
- Sit-to-stand from a sturdy chair
- Squats or supported squats
- Wall push-ups
- Resistance-band rows
- Step-ups
- Calf raises
- Light dumbbell exercises
Aim to progressively make the exercises more challenging while maintaining good technique. Older adults or people who are frail should consider getting guidance from a physiotherapist or qualified exercise professional before beginning.
Protein matters too
Muscle needs adequate dietary protein to repair and maintain itself. Good sources include:
- Eggs
- Fish and chicken
- Milk and yogurt
- Beans and lentils
- Soy and other legumes
- Nuts and seeds
Rather than concentrating all your protein into one meal, including a meaningful protein source at each meal can be a practical strategy.
There isn’t a single magic protein amount appropriate for everyone. Requirements depend on age, body size, activity level, kidney function, and overall health. People with kidney disease should discuss high-protein diets or protein supplements with their healthcare professional.
Don’t overlook everyday movement
Strength training is important, but walking, climbing stairs, carrying groceries, gardening, and other daily activities also help preserve physical function. Balance exercises are particularly valuable for older adults because maintaining muscle and balance can help reduce fall risk.
Can sarcopenia be reversed?
Often, muscle strength and physical function can improve substantially, even in older adults. Muscle mass may also increase with appropriate resistance training and nutrition. The goal isn’t necessarily to regain the muscles of your 20s—it’s to preserve enough strength, mobility, independence, and function to live well.
If muscle loss is rapid, unexplained, or accompanied by significant weight loss, weakness, difficulty walking, or repeated falls, it deserves medical evaluation rather than simply being attributed to aging.
