The Useful Poison
Antioxidant supplements can neutralise the health benefits of exercise.
That’s not a paradox — it’s hormesis. In 2009, researchers at ETH Zurich gave exercisers vitamins C and E alongside their training. The control group got nothing. After four weeks, the supplement group showed none of the expected improvements in insulin sensitivity. The antioxidants had neutralised the oxidative stress from exercise — and that stress was the entire point.
Your cells operate on a counterintuitive principle: small doses of damage trigger repair systems that overshoot, leaving you stronger than before. Exercise floods muscles with reactive oxygen species at ten to twenty times resting levels. That burst activates NRF2, a master switch for over 200 protective genes. The result is more antioxidant capacity than you started with. Not despite the stress. Because of it.
The same logic runs through fasting (which triggers autophagy — cells digesting their own damaged parts), cold exposure (which triples norepinephrine), and even low-dose radiation. Residents near Ramsar, Iran absorb background radiation at a hundred times the global average. They show enhanced DNA repair, not increased cancer.
The dose-response curve is an inverted U. Too little stress: no adaptation. Too much: damage wins. The hormetic zone is where biological systems do something machines cannot: use breakdown as a building instruction.
Every gym session is a controlled poisoning. The soreness isn’t the cost of getting stronger. It’s the mechanism.