Daily coffee might slow cellular aging and severe mental illness. A recent study suggests that moderate coffee drinking could help slow biological aging in individuals with serious mental health conditions, like schizophrenia or bipolar disorder. Conducted by researchers at King’s College London and published in BMJ Mental Health, the research analyzed data from 436 adults diagnosed with schizophrenia spectrum disorders or affective disorders. The key measure was telomere length—a well-established indicator of biological aging—alongside participants’ self-reported daily coffee consumption. Those who consumed up to four cups of coffee per day had noticeably longer telomeres compared to non-drinkers, equivalent to being biologically around five years younger. This effect held even after adjusting for factors such as age, sex, ethnicity, medication use, smoking status, and diagnosis. The relationship followed an inverted J-shaped pattern: benefits increased up to approximately four cups daily, but no further significant gains were observed beyond that amount. The researchers emphasize several limitations. Coffee intake was self-reported, without details on type (e.g., instant vs. brewed), strength, preparation, timing, or other sources of caffeine. The study is observational, so it cannot prove that coffee directly causes slower aging. Potential mechanisms, such as coffee’s antioxidant and anti-inflammatory effects, are speculative and were not tested directly. Although excessive coffee intake can harm health—particularly sleep—the authors advocate for a balanced perspective, viewing moderate consumption as a potentially helpful, adjustable lifestyle factor for a population already vulnerable to accelerated aging and related diseases. [Aas, M., Mlakar, V., & colleagues. (2025) "Coffee consumption and telomere length in individuals with severe mental illness" BMJ Mental Health, 28(1), e301700]