Stop focusing on the scale—you might be "skinny fat" and destroying your metabolism from the inside out. Dr. Gabrielle Lyon reveals why muscle is the "organ of longevity" and explains the exact protein threshold you’re likely missing to stay sharp and resilient as you age While most doctors focus on body fat, this conversation shifts the center of gravity to skeletal muscle health plus the impact of nutrition on gut health and mental health for a holistic approach to health care for your brain.