Muscle mass and metabolism changes during aging

As individuals age, biological changes such as declining muscle mass, a slowing metabolism, and increased body fat become more prevalent. By age 80, a person may lose between 30% and 50% of their skeletal muscle mass and function. This age-related muscle loss, known as sarcopenia, reduces daily energy expenditure because muscle is metabolically active tissue.

Resistance training, or weightlifting, can significantly mitigate these declines by triggering a chain reaction across the nervous, muscular, hormonal, and energetic systems. Initial strength gains are often driven by neurological adaptations, where the nervous system becomes more efficient at mobilizing motor units.

Metabolic health is a complex process involving energy production, blood sugar regulation, and cellular repair. While many seek supplements marketed as fat burners, experts suggest focusing on nutrients that support underlying cellular machinery, mitochondrial function, and the maintenance of muscle mass to support healthy aging.