Researchers at Queen Mary University of London report that caffeine activates AMPK, a conserved cellular energy sensor, in fission yeast. Published in Microbial Cell, the study shows caffeine influences cell growth, DNA repair responses and stress resistance by acting through AMPK rather than directly on TOR. While AMPK is also implicated in metformin’s effects, the authors stress these yeast results do not prove coffee slows aging in humans. The work supplies new mechanistic clues for longevity research.
Study: Caffeine Activates AMPK — A Cellular 'Fuel Gauge' Linked to Aging
(Dreamstime)
Your morning coffee may do more than increase alertness. Researchers at Queen Mary University of London report that caffeine activates AMPK — an ancient cellular energy sensor — in fission yeast, influencing processes tied to aging such as growth control, DNA repair responses and stress resistance.
What the Study Found
The experiments, published in Microbial Cell by Queen Mary’s Cellular Ageing and Senescence laboratory and summarized by ScienceDaily, used fission yeast as a model system. Although simple, this single-celled organism shares many core biological mechanisms with human cells, making it useful for uncovering basic cellular pathways.
Previous work suggested caffeine might extend yeast lifespan by affecting TOR (Target of Rapamycin), a conserved pathway that senses nutrients and regulates growth. The new results reveal a different mechanism: caffeine appears to act through AMPK (AMP-activated protein kinase), a highly conserved energy sensor that helps cells respond when energy is low.
"When your cells are low in energy, AMPK kicks in to help them cope," said Charalampos (Babis) Rallis, the study's senior author. "Our results show that caffeine helps flip that switch."
Biological Implications
In the yeast model, AMPK activation by caffeine affected cell growth, DNA damage responses and resistance to stress. Because AMPK is conserved from yeast to humans, these findings provide mechanistic clues for how caffeine might modulate cellular energy management and longevity-related pathways.
The study also notes an overlap with the mechanism of metformin, a diabetes drug under investigation for potential longevity effects. However, the researchers emphasize that showing a shared pathway in yeast does not mean caffeine is an anti-aging treatment for people.
"These findings explain why caffeine might be beneficial for health and longevity," said John-Patrick Alao, the postdoctoral research scientist who led the study. "They also open up possibilities for future research into how we might trigger these effects more directly — through diet, lifestyle or new medicines."
Limitations and Cautions
Crucially, the experiments were performed in fission yeast, not in humans. Results from simple organisms do not automatically translate to human biology. The study provides valuable mechanistic insight but does not demonstrate that drinking coffee slows human aging or extends lifespan.
Still, identifying caffeine’s action on a conserved energy sensor like AMPK gives researchers another lead to explore in mammalian systems and, eventually, clinical studies.
Source: Queen Mary University of London; published in Microbial Cell. © 2026 NewsmaxHealth. All rights reserved.
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