Research Article Summary
• Core argument:
This commentary challenges the long-standing assumption that environmental pollution and low-dose external exposures are the primary drivers of cancer and aging-related diseases, arguing instead that normal human metabolism is the dominant source of biological damage over a lifetime
• Endogenous damage vs. environmental exposure:
The author explains that routine metabolic processes generate orders of magnitude more reactive oxygen species and DNA damage than background ionizing radiation, meaning that biological defense and repair systems evolved mainly to manage internal damage rather than low-level environmental exposures
• Implications for radiation risk models:
Because endogenous DNA damage vastly exceeds that caused by background radiation, the paper argues that linear extrapolation models (such as LNT) substantially overstate the health significance of low-dose radiation and fail to reflect biological reality
• Hormesis and adaptive responses:
Drawing on decades of experimental work, including animal studies, the article describes evidence that low-dose radiation can activate immune and repair mechanisms, leading to improved health outcomes and increased lifespan in certain models, consistent with hormesis rather than cumulative harm
• Public health and regulatory consequences:
The author concludes that environmental and public health agencies have misdirected priorities by focusing excessively on minimizing trivial external risks, while largely ignoring the far greater impact of endogenous biological processes, calling for a fundamental reassessment of the precautionary principle and radiation protection policy
Original Source Article
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https://doi.org/10.1080/15459624.2025.2589127