New research shows three to four cups of coffee daily could protect telomeres and slow biological aging, especially in severe mental illness.
Unlike the number of birthdays you’ve celebrated, biological aging measures how your cells and organs are really doing. Influenced by genetics, lifestyle, diet and environment, it may also respond to something as simple as your daily coffee intake.
A recent study published in an open-access, peer-reviewed medical journal, BMJ Mental Health, examined over 400 adults with severe mental illness and found that drinking three to four cups of coffee daily was linked to a biological age roughly five years younger than non-coffee drinkers [1].
Coffee and telomeres: the cellular caps of aging
Telomeres are the protective “caps” at the ends of chromosomes, like plastic tips on shoelaces, which prevent DNA from fraying. As we age, these telomeres naturally shorten, but oxidative stress and inflammation can accelerate the process.
The Norwegian study, part of the TOP study collected between 2007 and 2018, found that participants who drank three to four cups of coffee daily had longer telomeres than those who drank less or more [2]. Drinking beyond four cups offered no additional benefit and could even be harmful, potentially promoting oxidative damage.
“Telomeres are highly sensitive to both oxidative stress and inflammation, further highlighting how coffee intake could help preserve cellular aging in a population whose pathophysiology may be predisposing them to an accelerated rate of aging,” the study authors explained [3].
Who benefits most: people with severe mental illness
Individuals with bipolar disorder, schizophrenia or major depressive disorder with psychosis tend to have shorter telomeres and a reduced life expectancy of up to 15 years compared with unaffected peers.
“Our study shows that up to four cups of coffee per day is linked to longer telomeres among people with bipolar disorder and schizophrenia. This is comparable to a biological age of five years younger than non-coffee drinkers,” said Vid Mlakar, PhD student at King’s College London and first author of the study.
For them, lifestyle factors like coffee intake may be among the few modifiable ways to influence biological aging.
“Many of the factors that affect biological aging, such as genetics and stressful life experiences, are beyond our control,” said Dr Monica Aas, MRC Research Fellow at King’s College London and senior author of the study. “Lifestyle factors like coffee consumption are something we can actively modify, making research like this particularly valuable.”
More is not always better
The study found no telomere benefit for participants drinking more than four cups daily. Excessive consumption can reduce sleep quality and potentially increase cellular damage.
Researchers emphasize that coffee should not be seen simply as “good or bad,” but should be considered as part of a balanced approach to health.
If you’re curious about your own biological age or want to see if your lifestyle is actually working, you don’t have to guess. Longevity clinics can help you measure markers like telomere length, track key biomarkers, and guide you toward tailored nutrition, exercise, and supplement strategies.
Our Longevity Clinics Directory connects you with clinics that combine cutting-edge diagnostics with clinician oversight, so you can make choices backed by science rather than online hype.
Coffee as part of a broader healthspan strategy
While the new research on coffee and telomere length is intriguing, it’s essential to see it as one piece of a much larger healthspan puzzle. Three to four cups a day may offer modest protection against cellular aging, particularly in populations at risk for accelerated biological aging, but coffee alone is not a magic solution.
True longevity – both in terms of lifespan and healthspan – relies on a combination of evidence-backed lifestyle habits: regular physical activity, balanced nutrition, quality sleep, stress management and regular medical check-ups. Coffee can be incorporated thoughtfully, but not as a substitute for broader preventive measures.
Ultimately, moderate coffee intake may be a small but meaningful lever in maintaining cellular resilience. Yet the broader lesson is clear: healthspan isn’t shaped by single interventions; it’s built through thoughtful, evidence-informed choices over a lifetime.
[1] https://mentalhealth.bmj.com/content/28/1/e301700
[2] https://www.kcl.ac.uk/news/coffee-linked-to-slower-biological-ageing-among-those-with-severe-mental-illness-up-to-a-limit
[3] https://nypost.com/2025/11/26/health/this-many-cups-of-coffee-may-help-slow-down-biological-aging/
