Unexplained loss of muscle mass, also known as idiopathic sarcopenia, refers to the gradual loss of skeletal muscle that cannot be attributed to a specific disease or health condition. Potential causes may include:
- Age-related muscle loss (sarcopenia): As we get older, muscle tissue begins to break down faster than it can rebuild, often starting around age 30. This natural decline speeds up significantly after age 60.
- Sedentary lifestyle: Not getting enough physical activity accelerates the loss of muscle over time. Weight training and other resistance exercises help counteract this.
- Inadequate protein intake: Consuming too few calories or not enough high-quality protein makes it difficult for the body to maintain muscle. Most experts recommend 0.5-0.8 grams of protein per pound of body weight daily.
- Hormonal changes: Reduced levels of key hormones like testosterone, growth hormone, insulin, and IGF-1 hasten muscle loss. This is common during menopause and andropause.
- Chronic inflammation: High levels of inflammatory markers in the body may contribute to faster muscle breakdown.
Symptoms of unexplained muscle loss include feeling weaker during everyday tasks, visible thinning of the arms and legs, and unexpected weight loss despite maintaining your typical diet.
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