Your morning coffee may do more than help you wake up.
Research from Queen Mary University of London suggests that caffeine can activate an ancient cellular energy system involved in growth, stress resistance and DNA repair. Those processes are closely linked to aging, which could help explain why caffeine has been linked to possible health benefits in previous studies.
The findings come from the Cellular Aging and Senescence laboratory at the Center for Molecular Cell Biology at Queen Mary University of London and were published in microbial cell.
Caffeine is the most widely used neuroactive compound in the world, meaning it affects the nervous system and brain activity. Most people know it for increasing alertness, but scientists have also been interested in its possible connection to a lower risk of some age-related diseases.
What has been less clear is how caffeine might produce those effects inside cells.
A clue to the “mini-human” yeast
To investigate, the researchers turned to fission yeasta single-celled organism that shares many important biological characteristics with human cells.
Because of those similarities, fission yeast is sometimes called “mini-human” and is widely used to study basic cellular processes.
The team found that caffeine appears to affect aging by tapping into a deeply conserved energy-sensing system. In biology, conserved pathways are mechanisms that have remained similar throughout evolution because they perform essential functions.
A few years ago, the same research group showed that caffeine could help cells live longer by influencing a growth regulator called TOR (target of rapamycin).
TOR acts as a cell growth switch. It helps cells decide when to grow based on the amount of food and energy available.
That system is remarkably old. Versions of it have been regulating growth, energy use and stress responses in living organisms for more than 500 million years.
Caffeine doesn’t work where scientists expected
The latest study revealed a surprising twist.
Instead of acting directly on TOR, caffeine appears to act through another important cellular system called AMPK.
AMPK (AMP-activated protein kinase) is a cellular energy sensor that plays a vital role in maintaining metabolic balance. In simple terms, it works as a fuel gauge, helping cells detect when energy is running low and adjust accordingly.
“When cells are low on energy, AMPK steps in to help them cope,” explains Dr. Charalampos (Babis) Rallis, Professor of Genetics, Genomics and Fundamental Cell Biology at Queen Mary University of London, senior author of the study. “And our results show that caffeine helps flip that switch.”
That finding is important because AMPK is found in both yeast and humans, making it an important target for researchers studying metabolism, aging and disease.
The connection with metformin
AMPK is also related to metformin, a widely used diabetes drug that has attracted attention in longevity research.
Metformin is best known for helping to control blood sugar, but scientists have also been studying whether it can influence biological pathways associated with aging. Rapamycin, another compound that affects growth-related signaling, is also being investigated for its possible effects on lifespan.
That makes caffeine’s connection to AMPK especially intriguing.
Researchers found that caffeine’s effects on this pathway can influence several cellular processes related to aging and disease, including cell growth, stress responses, and DNA repair.
DNA repair is especially important because genetic damage can accumulate over time. If cells fail to repair that damage effectively, normal function may decline and the risk of disease may increase.
What this means for aging
“These findings help explain why caffeine could be beneficial for health and longevity,” said Dr. John-Patrick Alao, a postdoctoral research scientist leading this study. “And they open up interesting possibilities for future research into how we might trigger these effects more directly: with diet, lifestyle, or new medications.”
The study does not prove that drinking coffee makes people live longer. The experiments were carried out in fission yeast and results from simple organisms do not always translate directly to humans.
Still, the fact that AMPK is shared between yeast and humans gives researchers a useful biological clue.
Caffeine may not just stimulate the brain. It also appears capable of activating an ancient cellular system that helps regulate energy, stress, growth and repair, all of which play important roles in aging cells.