How does muscle atrophy occur?

Muscle atrophy primarily occurs due to a lack of training and suboptimal nutrition. As explained by Dr. Andy Galpin and Andrew Huberman, muscle function loss with age can often be predominantly attributed to a decline in consistent training rather than just aging itself. Factors like anabolic resistance also play a role. Importantly, even at advanced ages, initiating or maintaining strength training can lead to significant improvements in muscle size and function. The linkage between the neuromuscular system and brain health also highlights the comprehensive benefits of regular physical activity in preventing muscle atrophy 1.