When people think of life-threatening medical conditions, end-stage kidney disease — requiring dialysis and a waiting list for an organ transplant — typically comes to mind as a grave prognosis.
But new comparative risk data presented by Dr. Peter Attia, a guru in longevity medicine, reveal that being profoundly unfit carries a similar level of danger.
Attia, speaking with neuroscientist and podcaster Dr. Andrew Huberman, laid out a series of hazard ratios for various conditions and behaviors, allowing a direct comparison:
| Condition / Risk Factor | Increase in All-Cause Mortality Risk |
|---|---|
| End-stage kidney disease (on dialysis) | 175% (hazard ratio 2.75) |
| Low strength (vs. high strength) | 250% (hazard ratio 3.5) |
| Low muscle mass (vs. high muscle mass) | 200% (hazard ratio 3.0) |
| Bottom 25% VO2 max (vs. 50th-75th percentile) | 100% (2x risk) |
| Type 2 diabetes | 25% |
| High blood pressure | 20-25% |
| Smoking | 40% |
While end-stage kidney disease is devastating, Attia notes that the underlying causes — profound hypertension and uncontrolled type 2 diabetes — are themselves modifiable. But the standout finding is that cardiorespiratory fitness sits at the very top of the risk hierarchy for behaviors people can actually change.
Being in the bottom quarter of VO2 max for your age and sex doubles your risk of death compared to someone in the average-to-above-average range. And compared to the elite top 2.5%, the bottom quarter faces a 5-fold higher risk.
“These are patients that are on dialysis, waiting for an organ,” Attia said of the end-stage kidney disease group. But the underlying message cuts the other way: poor fitness is not a benign condition.
It is a medical risk factor on par with some of the most serious chronic disease states — and unlike waiting for a donor organ, fitness is entirely within an individual’s control.