The newly published research suggests something surprising and hopeful. Scientists found that people with severe mental disorders who drank three to four cups of coffee a day had longer telomeres, which are tiny protective caps on chromosomes linked to cellular aging. This matters now because shorter telomeres are common in schizophrenia and bipolar disorder, and they are tied to a higher risk of early physical illness.
Fast Facts
Study: New research links moderate coffee intake with longer telomeres in severe mental disorders. Finding: Drinking 3–4 cups daily was associated with telomere lengths equal to a biological age about five years younger. Why It Matters: Shorter telomeres are common in schizophrenia and bipolar disorder, increasing physical health risks. Limit: Benefits disappear beyond four cups per day. Implication: A simple daily habit may influence long-term cellular aging in vulnerable groups.
The core discovery shows an inverted J-shaped curve. Coffee drinkers who stayed within the recommended limit of up to four cups a day had the longest telomeres. Those who drank no coffee had shorter ones, and those who exceeded four cups a day lost the benefit. The gain was meaningful. Telomeres in the moderate-coffee group matched what researchers say looks like five years younger biological age compared with non-drinkers. This insight adds new clarity to years of mixed results in the general population, finally showing a clear pattern for psychiatric groups.
Researchers proved this through a large cross-sectional study of 436 people diagnosed with schizophrenia spectrum or affective disorders in Norway. They measured telomere length using qPCR, a lab method that compares the ratio of telomere DNA to a reference gene. To keep the science simple, qPCR works like a molecular ruler that estimates how long these chromosome caps are. Coffee intake came from clinical interviews, grouped from zero cups to five or more. The results held even after adjusting for age, sex, ethnicity, smoking years, and psychiatric medication.
This finding matters because people with severe mental disorders often face faster biological aging. They also live with higher rates of cardiovascular disease, cancer, and metabolic illness. Telomere shortening plays a role in these risks. The study suggests that a simple habit, such as staying within a recommended coffee limit, might support healthier aging in a group already biologically vulnerable. Although it does not claim coffee reverses illness, it hints at a practical lifestyle factor that could reduce long-term health decline.
Experts behind the study note that coffee contains antioxidants like chlorogenic acid and trigonelline, which may protect telomeres by reducing inflammation and oxidative stress. These processes tend to be elevated in schizophrenia and bipolar disorder. The authors also highlight a second pathway in which caffeine may increase TERT expression, a key enzyme involved in telomere maintenance. Still, they caution that drinking more than four cups can reverse the benefit because high intake may generate reactive oxygen species, which damage cells. This tension shows that dose matters.
The study also links to broader issues. Coffee drinking patterns often rise with smoking, which is more common in psychiatric populations. Smoking increases caffeine metabolism, leading people to consume more coffee to feel the same effect. Because both smoking and accelerated aging are public health concerns, understanding how lifestyle factors interact could shape future mental health guidelines. The work also connects to larger conversations about nutrition, chronic inflammation, and how everyday habits shape long-term biological health across the world.
Next, researchers plan to explore other markers of biological aging, such as DNA methylation clocks and brain-aging measures. They also want to study whether timing, type of coffee, and caffeine level matter. The study was cross-sectional, which means it shows association, not cause. It also lacked healthy controls, and did not track other caffeine sources like tea or energy drinks. These open questions mean more research is needed before experts can recommend coffee as a formal intervention.
The takeaway is clear. This new study suggests that moderate coffee intake may help protect cellular aging in people with severe mental disorders, but drinking beyond the recommended amount removes the advantage. It is an early but encouraging sign that small, everyday choices could meaningfully support long-term health in groups at risk of faster biological decline.
Story Source: Materials provided by BMJ Mental Health. Content may be edited for style and length.
Journal Reference: Mlakar V, Di Forti M, Halff EF, Srivastava DP, Akkouh I, Djurovic S, Martin-Ruiz C, Quintana DS, Birkenæs V, Steen NE, Ormerod MBEG, Andreassen OA, Aas M. Coffee intake is associated with telomere length in severe mental disorders. BMJ Mental Health, 2025; 28(1). DOI: 10.1136/bmjment-2025-301700.