Roundworms fed a magnetic bacterium lived 43.39 percent longer on average than untreated worms, according to a team at the Hefei Institutes of Physical Science of the Chinese Academy of Sciences. Prof. Xu An led the study, which tested the microbe Magnetospirillum magneticum AMB-1 on Caenorhabditis elegans, a nematode that is a standard laboratory stand-in for aging research.
The result applies to worms and to one specific strain of bacteria, and the team reports that variants without magnetic properties did not deliver the same effect. Nothing in the work tests the idea in people.
One strain, two comparison strains and a worm model
Magnetotactic bacteria are microbes that orient themselves along magnetic field lines, a trait that depends on the magnetosomes they build internally. AMB-1 is a well-studied member of the group. C. elegans, for its part, is a millimeter-long roundworm whose adult life lasts only a matter of weeks, which lets researchers run a full survival experiment quickly and compare many treatments side by side.
The Hefei group’s institute news item describes three versions of AMB-1. The wild-type strain makes magnetosomes, the chains of magnetic mineral particles that give magnetotactic bacteria their name, and it was the most effective. A reversibly non-magnetotactic variant, called RNM-AMB-1, produced an intermediate result. A non-magnetotactic variant, NM-AMB-1, had no effect on lifespan. The pattern points to the magnetic structures, and not simply the presence of the bacterium, as the ingredient doing the work. The size of the gain also scaled with the strain: the stronger the magnetic machinery, the larger the lifespan benefit the team recorded.
The 43.39 percent figure is the increase in average lifespan for treated C. elegans compared with untreated control worms, as stated in the Chinese Academy of Sciences’ English-language news item. The release does not give the baseline lifespan in days or the dose used, so the length of an average treated life cannot be stated from those documents. The results appeared in Free Radical Biology and Medicine, with Yuting Ding named among the authors in SciTechDaily’s coverage, which dates the paper to June 26, 2026.
Ferroptosis, iron and three genes
The proposed mechanism runs through ferroptosis, an iron-dependent form of cell death that has been linked to aging. In the Hefei account, AMB-1 reduced iron accumulation and lipid peroxidation in the worms, which suppressed aging-related ferroptosis. Three ferroptosis-related genes, ftn-1, bli-3 and ads-1, were involved in the longevity effect.
Lipid peroxidation is the oxidative damage that builds up in cell membranes when iron is not kept in check, so a bacterium that lowers both measures would plausibly slow that damage. The research team presents this as a pathway the experiments implicate rather than a complete explanation, and the releases do not describe how the bacterium’s magnetosomes interact with the worm’s iron handling.
Healthspan results in older worms
Lifespan was not the only readout. According to The Microbiologist’s report, the treatment extended healthy organismal lifespan, and the Hefei account says AMB-1 improved neurological function and maintained intestinal integrity in aged worms. Those are measures of how well the animals functioned late in life, a separate question from how many days they survived. Average lifespan, the figure behind the 43.39 percent, is also not the same as maximum lifespan, and the public summaries report only the former.
The team frames the work as groundwork. It describes the findings as foundational evidence for expanding magnetotactic bacteria applications in geriatric medicine and as a novel microbial anti-aging strategy. That wording is a research direction, not a claim of a therapy.
C. elegans-only evidence and the missing human safety data
The timeline matters for reading the finding as news. The paper’s journal publication is dated June 26, 2026 in SciTechDaily’s account, the Hefei Institutes posted its summary on July 23, and the Chinese Academy of Sciences carried an English item on July 27, so the 43.39 percent result is a summer finding that resurfaced in late September, not a fresh experiment.
The study used only C. elegans. Human efficacy and safety are not established, and SciTechDaily notes that the safety of magnetotactic bacteria in people was not explored in this research. Dosage and feeding protocol are not spelled out in the public summaries, which makes independent comparison with other worm longevity studies difficult until the full paper is read in detail.
The effect also depends on the bacterium’s magnetic machinery, since the strain with no magnetosomes did nothing, so any claim about “probiotics” in general would overreach. A later write-up of the paper from late September carried the same 43 percent figure and the same worm model, and the work remains a single-lab result in one species. The Hefei team has not reported tests in mammals, and the 43.39 percent average-lifespan gain stays the only quantified outcome in the public material.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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