What single number best predicts how long you'll live? Not your cholesterol. Not your blood pressur

What single number best predicts how long you'll live? Not your cholesterol. Not your blood pressure. Not even your weight. It's your VO2 max — the peak volume of oxygen your body can use during exercise. And most physicals never test it. The evidence: Mandsager et al. tracked 122,007 adults over a decade (JAMA Network Open, 2018). Low VO2 max was more strongly associated with mortality than smoking, diabetes, or high blood pressure. Elite fitness was linked to a 5-fold lower risk of death vs. the bottom quartile. Honest caveat: this is observational — it shows association, not proof of cause. But the signal is consistent across dozens of cohorts and it's mechanistically plausible. As a medical school professor who has worked at both UCLA and USC, I now teach clinicians to think of VO2 max as a vital sign. It reflects heart, lung, muscle, and mitochondrial function all at once — the metabolic engine of longevity. You can move up the curve at any age. Zone 2 training + short high-intensity intervals is the fastest proven way to raise it. Ask your doctor for a CPET, or use a validated wearable estimate. Track it. Train it. I'm Dr. Robert Lufkin, and that's how you live well, longer. 👇 Free weekly metabolic breakdown — link in bio. #VO2max #Cardio #Longevity #Fitness #MetabolicHealth #Mortality #PreventiveMedicine #HealthLongevitySecrets