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    Scientific illustration for Hormesis: Why Small Stressors Make You Stronger
    Physiology
    14 MIN READ

    Hormesis: Why Small Stressors Make You Stronger

    Hormesis is the biological principle whereby exposure to low doses of a stressor — whether physical, thermal, chemical, or radiation-based — triggers an adaptive response that improves resilience and function, whilst the same stressor at high doses causes harm. This dose-response phenomenon underpins the health benefits of exercise, cold water immersion, intermittent fasting, heat stress, and even certain plant compounds — all of which activate stress-response pathways including Nrf2, AMPK, and sirtuins that upregulate cellular repair, antioxidant defences, and mitochondrial biogenesis. Understanding hormesis fundamentally changes how we approach health optimisation, explaining why discomfort — within physiological limits — is not merely tolerable but essential for biological adaptation and longevity.

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