Barbell Medicine Podcast Episode #386: Longevity Myths- Biological Clocks, GLP-1 Muscle Loss, and What Actually Predicts Lifespan
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Feb 13, 2026 
Austin Baraki, physician specializing in cardiometabolic health and therapeutic use of GLP-1s and HRT. They unpack DNA methylation clocks and their limits. They debate real muscle loss versus lean mass changes on GLP-1s. They highlight VO2max, strength, blood pressure, and ApoB as practical longevity targets.
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Prescribe Exercise Treat‑To‑Target
- Treat exercise like medicine: increase aerobic volume (300–600 min/wk) and lift 2–3×/wk with challenging loads.
- Monitor progress and adjust prescriptions if VO2 or strength targets don't improve.
Protein-Longevity Links Are Contextual
- mTOR-mediated mechanistic arguments for protein restriction come primarily from rodents and may not translate to human longevity outcomes.
- Protein intake effects differ by source, age, and activity, making one-size-fits-all rules unreliable.
Favor Moderate Protein With Plant Bias
- For most people, aim for ~1.2–1.6 g/kg/day of protein, biasing toward plant sources where possible.
- Prioritize resistance training and overall diet quality over obsessing about marginal protein increases.
