That daily cup of coffee might be doing far more than perking you up. New research suggests caffeine could be quietly switching on an ancient cellular system tied to slower ageing, stronger stress resistance, and better DNA repair.
The study comes from the Cellular Ageing and Senescence laboratory at the Queen Mary University of London’s Centre for Molecular Cell Biology. Caffeine is the most widely consumed neuroactive substance on the planet, best known for keeping people alert. But scientists have long suspected it does more, given its associations with a lower risk of certain age-related diseases. Exactly how it might produce those effects at the cellular level, though, has remained something of a mystery.
To dig deeper, the researchers turned to fission yeast — a simple, single-celled organism that, despite its size, shares many core biological processes with human cells. That similarity has earned it the nickname “mini-human” among scientists studying the fundamentals of how cells function and age.
Using this model, the team found that caffeine taps into a deeply conserved energy-sensing system, one that has been shaping how living cells manage growth, energy, and stress for more than 500 million years. A few years earlier, the same research group had shown that caffeine could extend cellular lifespan by influencing TOR (Target of Rapamycin), a growth regulator that essentially tells cells when it’s safe to grow based on available energy and nutrients.
This time, though, the results took an unexpected turn. Rather than acting on TOR as expected, caffeine appeared to work through a different pathway altogether — AMPK, or AMP-activated protein kinase. Often described as the cell’s fuel gauge, AMPK helps detect when energy levels are dropping and triggers the right adjustments to keep things balanced.
By activating AMPK, caffeine seems to give cells a boost in handling stress and repairing damage, mechanisms that are closely linked to how organisms age. While the research was conducted in yeast rather than humans, the findings offer a promising lead into why caffeine has repeatedly shown up in studies on healthier ageing, and could open new doors for therapies targeting the same biological pathway.
(Journal: Microbial Cell)