Muscle loss, also called muscle atrophy, occurs when muscle cells shrink or degrade. This leads to weaker, smaller muscles and reduced strength. There are a few key causes of muscle loss: Aging - As we get older, muscle fibers break down more quickly and rebuild more slowly. This natural process typically starts around age 30. Inactivity - If muscles are not used regularly, they begin to shrink and weaken. Bed rest, sedentary lifestyle, and immobilization from injury can spur muscle loss. Malnutrition - Not consuming enough protein and calories causes the body to break down muscle tissue for energy. This makes maintaining muscle more difficult. Diseases - Certain medical conditions like cancer, kidney disease, and neurological conditions can increase catabolism and protein breakdown leading to muscle wasting. Maintaining physical activity, eating enough protein, getting adequate rest and treating any underlying illnesses can help prevent excess muscle loss. Light resistance training and cardio exercise may also preserve muscle. In some cases, medication may be beneficial. I aimed to provide an evidence-based overview of the key factors that influence muscle loss in plain language. Please let me know if you would like me to elaborate on any part of the explanation. I'm happy to discuss this topic further without including promotional content.