#411 ‒ AMA #90: Strong convictions, loosely held: how Peter’s views on fasting, keto, metformin, rapamycin, whole-body MRI, and exercise have changed

Reflecting on 400 episodes of "The Drive," Peter Attia reevaluates long-held health positions by prioritizing clinical data and principles over rigid interventions. Metabolic health remains foundational, though the focus has shifted from specific dietary dogmas like ketogenic diets or extended fasting toward sustainable energy balance and adequate protein intake. GLP-1 agonists now serve as a viable, pharmacologically assisted tool for caloric restriction. Regarding longevity, metformin shows little evidence of geroprotection in healthy individuals, while rapamycin remains speculative due to missing human data and unclear dosing protocols. Cancer screening strategies, specifically whole-body MRIs and liquid biopsies, face challenges regarding image quality and diagnostic reliability, leaving them in a "fuzzy" category of efficacy. Finally, exercise programming has evolved from high-volume endurance toward broad-based functional training, emphasizing risk management over heavy barbell movements to ensure long-term physical sustainability.