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Your morning coffee may be doing more than helping you wake up.
A study out of Queen Mary University of London indicates that caffeine can switch on an ancient cellular energy system tied to growth, stress resistance, and DNA repair — processes closely linked to aging. This may shed light on why earlier research has associated caffeine with certain health benefits.
The work comes from the university’s Cellular Ageing and Senescence laboratory, based in its Centre for Molecular Cell Biology, and appears in Microbial Cell.
Caffeine ranks as the most widely consumed neuroactive substance on Earth, acting on the brain and nervous system. While it’s best known for sharpening alertness, researchers have also probed whether it might lower the risk of certain diseases associated with aging.
Exactly how caffeine might trigger such effects at the cellular level, however, has remained murky.
A Clue From “Mini-Human” Yeast
To dig into the question, the scientists studied fission yeast, a single-celled organism whose biology overlaps substantially with that of human cells.
That overlap has earned fission yeast the nickname “mini-human,” and it’s a common model organism for probing fundamental cell biology.
According to the researchers, caffeine’s influence on aging works through an ancient, evolutionarily preserved energy-sensing network — the kind of pathway that has stuck around across species because it handles jobs too essential to lose.
Previously, the same lab had shown that caffeine could extend cellular lifespan by acting on TOR (Target of Rapamycin), a key regulator of growth.
TOR functions somewhat like a switch that governs cell growth, letting cells “decide” whether to grow based on available food and energy.
This system is ancient by any measure — versions of it have governed growth, energy use, and stress responses in living things for upwards of 500 million years.
Caffeine Does Not Act Where Scientists Expected
But the new study turned up something unexpected.
Rather than working through TOR directly, caffeine seems to act primarily through a separate cellular system: AMPK.
AMPK, short for AMP-activated protein kinase, functions as a cellular energy gauge central to metabolic regulation — essentially detecting when a cell’s energy is running low and prompting a response.
“When your cells are low on energy, AMPK kicks in to help them cope,” explains Dr. Charalampos (Babis) Rallis, Reader in Genetics, Genomics and Fundamental Cell Biology at Queen Mary University of London, the study’s senior author. “And our results show that caffeine helps flip that switch.”
Because AMPK exists in both yeast and humans, this discovery gives it added weight as a target for scientists studying metabolism, aging, and disease more broadly.
The Metformin Connection
AMPK also has ties to metformin, a diabetes medication that has attracted considerable interest within longevity science.
While metformin is primarily prescribed for blood sugar control, researchers have also examined whether it affects biological pathways linked to aging — much like rapamycin, a separate compound tied to growth signaling that’s likewise under study for potential lifespan effects.
This context makes caffeine’s link to AMPK particularly notable.
According to the study, caffeine’s action on this pathway touches several processes connected to aging and disease, including:
- Cell growth
- Stress responses
- DNA repair
DNA repair stands out in particular, since unrepaired genetic damage accumulates over time, potentially impairing normal cell function and raising disease risk.
What This Means for Aging
“These findings help explain why caffeine might be beneficial for health and longevity,” said Dr. John-Patrick Alao, the postdoctoral research scientist leading this study. “And they open up exciting possibilities for future research into how we might trigger these effects more directly — with diet, lifestyle, or new medicines.”
The study stops short of proving that coffee drinkers will live longer — the experiments were done in fission yeast, and findings in simple organisms don’t always hold up in humans.
That said, since AMPK operates similarly in both yeast and people, it gives researchers a meaningful lead to follow.
Caffeine’s influence, then, may extend well beyond the brain. It appears able to switch on an ancient cellular system governing energy, stress, growth, and repair — all factors that shape how cells age.
The research was led by Alao, with contributions from Juhi Kumar, Despina Stamataki, and Charalampos Rallis. The paper, “Dissecting the cell cycle regulation, DNA damage sensitivity and lifespan effects of caffeine in fission yeast,” appears in Microbial Cell with the DOI 10.15698/mic2025.06.852.
Taken together, the findings point to a plausible biological explanation for caffeine’s long-rumored health effects, while also flagging a promising target for future research aimed at harnessing those effects more deliberately.
Source: sciencedaily.com
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