Dr. Amanda Marrone: Lifestyle Medicine, Preventive Testing & Personalized Health

Dr. Amanda Marrone is a family medicine physician and lifestyle medicine practitioner at Optimal U in Toronto. She focuses on using behavioral interventions and lifestyle factors to prevent and treat chronic disease at its root cause.Dr. Marrone discusses why the conventional healthcare model works well for acute disease but struggles with chronic conditions, and how lifestyle medicine addresses the root causes of disease through six core pillars: nutrition, physical activity, sleep, stress management, avoidance of harmful substances, and social connection. She explains the importance of specific blood tests that many doctors don't routinely order, how personalized testing can detect metabolic dysfunction years before disease appears, and why lifestyle medicine works alongside conventional treatments rather than replacing them. The conversation covers her "one thing" approach to sustainable habit change, why feeling better is the most powerful motivator for lifestyle shifts, and how patients can take control of their health through individualized testing and evidence-based lifestyle interventions.00:00 - Intro00:43 - What Is Lifestyle Medicine?03:34 - Why Time Matters in Healthcare08:12 - Blood Work as a Window Into Metabolic Health13:15 - The 4 Critical Tests Your Doctor Isn't Ordering17:37 - Sleep Apnea: The Undiagnosed Epidemic21:13 - Why Normal Blood Sugar Doesn't Mean You're Safe24:12 - How Testing Drives Behavior Change28:19 - Lifestyle Medicine + Conventional Medicine (Not Either/Or)31:03 - The "One Thing" Approach to Habit Change36:15 - Movement Snacks & Longevity40:02 - Why Weight Loss Should Be a Side Effect, Not the Goal