Mid-infrared light extends worm lifespan 60%

A February 2026 bioRxiv preprint reported that super-weak mid-infrared light extended the lifespan of the roundworm *Caenorhabditis elegans* by about 60%, adding a new physical intervention to a field usually dominated by genes, drugs and diet. The paper, posted by Changsheng Shao, Daoling Peng, Yunlong Zhao, Yousheng Shu, Songlin Zhuang, Qing Huang and Bo Song, said exposure to frequency-specific light at 34 terahertz prolonged median lifespan without detectable heating effects. The work came from researchers at the Hefei Institutes of Physical Science, part of the Chinese Academy of Sciences, with collaborators at Imperial College London, Fudan University, the University of Shanghai for Science and Technology and South China Normal University. The study is a preprint and has not been peer reviewed. ### What exactly did the researchers do to the worms? The authors said they exposed *C. elegans* to 34-THz mid-infrared light at roughly 1 microwatt per square millimeter and compared the treated worms with untreated controls. In the abstract, they said the intervention prolonged median lifespan by 60%, delayed the onset of aging and prevented what they called abrupt “cliff-edge” mortality late in life. (biorxiv.org) The same abstract said the treatment preserved youthful cellular homeostasis during aging. That is the basis for social-media claims that the worms kept better morphology and showed lower late-life mortality, though those details come from the preprint rather than an independent journal report. ### Why 34 terahertz and not some other frequency? The preprint said the effect was frequency-specific, not a generic infrared exposure result. (biorxiv.org) The authors linked the 33-35 THz range to vibrational modes of phosphate groups in nucleic acids and mitochondrial phospholipids, and said that provided a “frequency-matched molecular context” for the intervention. The authors’ argument is that the light may interact with molecular vibrations tied to cellular processes rather than acting through heat. (biorxiv.org) That remains the authors’ interpretation, not an established consensus, because the work is still at the preprint stage. ### What mechanism do the authors say is behind the effect? The abstract said mid-infrared exposure enhanced global gene transcription and coincided with a mitochondrial state of high-efficiency energy metabolism. (biorxiv.org) The authors wrote that these changes together preserved youthful cellular balance during aging. Bo Song and co-authors framed that as an “efficiency-first” model of aging, arguing that the intervention improved integrated cellular efficiency rather than triggering classic damage-repair or stress-response pathways. (biorxiv.org) That is a central claim of the paper, but it has not yet been vetted by peer review. ### How unusual is a 60% lifespan gain in C. elegans? A 60% increase is large by the standards of many light-based interventions in worms, though *C. elegans* lifespan studies often produce effects that do not translate to mammals. (biorxiv.org) The model organism is widely used in aging research because worms live only a few weeks and are easy to test in large numbers. Another recent worm study, for example, reported that early-life red light exposure extended lifespan by about 10.34%, a much smaller effect than the 34-THz result described here. (biorxiv.org) Cross-study comparisons are imperfect because exposure protocols and endpoints differ, but the gap shows why the new claim is drawing attention. ### What should readers be careful about before taking this further? The bioRxiv posting says the manuscript “has not been certified by peer review.” That means the data and interpretation have not yet cleared the normal journal review process, and outside replication will matter before the result can be treated as established. (nature.com) The next concrete checkpoint is journal submission or independent replication. (aginganddisease.org) For now, the underlying paper is available on bioRxiv under DOI 10.64898/2026.02.08.704722, with Changsheng Shao as first author and Bo Song among the listed authors. (biorxiv.org)