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Metformin and cancer: active surveillance needed

Peter Attia · 4 Jul 2026 · peterattiamd.com

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  1. MAST adds to a growing body of evidence suggesting that metformin is not a general-purpose anticancer drug.
  2. we now have multiple trials confirming that metformin interferes with your ability to reap the adaptive benefits of exercise, which is the most powerful broad-based longevity intervention available to us today
  3. That’s a lesson we could all learn about our approach to supplements and even drugs: not to fall for hazy promises that a single molecule will deliver vaguely-defined benefits for all aging persons, but to demand rigorous evidence for well-defined benefits for well-defined problems in well-defined populations.