Quick answer
Oxidative stress: definition
Oxidative stress is an imbalance between reactive oxygen species (free radicals) and the body's antioxidant defenses, which can damage cells when sustained.
Oxidative stress, explained
Reactive oxygen species also act as important signals — for example, during exercise. Some studies suggest very high-dose antioxidant supplements can blunt beneficial training adaptations.
Why it matters
Balance is the goal: food-based antioxidants and regular exercise support healthy defenses.
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Oxidative stress FAQs
What is Oxidative stress?
Why does Oxidative stress matter?
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