Coffee is one of the most popular drinks in the world, and most of us think of it mainly as a pic-me-up. But research keeps showing that coffee’s effects on the body are more complicated than just a caffeine boost. A new Finnish study of 2,264 adults adds to that picture. It found that people who regularly drink coffee tend to have healthier body composition, better metabolic markers, and even some interesting differences in hormone levels between men and women. These results help explain why coffee has long been linked to lower risks of chronic diseases.
The study used data from the Northern Finland Birth Cohort 1966, which has followed participants from birth into adulthood. Researchers looked at how much coffee people reported drinking and compared that with detailed health measurements. These included fat mass, visceral fat, muscle mass, metabolic biomarkers, and sex hormones. They also adjusted for age, BMI, smoking, alcohol use, physical activity, and other lifestyle factors to make sure the associations were not simply due to healthier habits overall.
Body Composition Findings
Leaner Fat Distribution
One of the most striking findings was that people who drank more coffee tended to have less total body fat and lower levels of visceral fat. What makes this especially interesting is that these differences appeared even when BMI was similar. This suggests that coffee might influence where fat is stored rather than overall weight. Since visceral fat is strongly tied to cardiometabolic disease risk, this is an important observation.
Increased Muscle Mass
Higher coffee intake was also linked to greater skeletal muscle mass. This held true even after accounting for lifestyle factors, which hints that coffee might play some role in supporting muscle maintenance. Scientists do not yet know the exact mechanism, but they suspect that coffee’s bioactive compounds may affect metabolic pathways involved in muscle preservation.
Metabolic Health Indicators
Branched Chain Amino Acids
People who drank more coffee had lower levels of branched chain amino acids. Elevated BCAAs are associated with insulin resistance and a higher risk of type 2 diabetes. The lower levels seen in coffee drinkers fit with earlier research suggesting that coffee may support healthier metabolic function.
Glucose and Insulin Profiles
Men who consumed more coffee also showed improvements in glucose and insulin markers. This lines up with previous evidence that coffee may help regulate processes tied to diabetes risk, although the biological mechanisms are still not fully understood.
Sex Specific Hormonal Differences
Hormonal Effects in Men
Men who drank more coffee had higher total and bioavailable testosterone, along with increased sex hormone binding globulin. At the same time, free testosterone and the free androgen index were slightly lower. This mix of changes suggests that coffee may interact with androgen regulation in complex ways that could affect both metabolic and reproductive health.
Hormonal Effects in Women
Women showed subtler hormonal shifts, mainly higher sex hormone binding globulin and lower free androgen measures. The effects were not as strong as those seen in men, but they were still statistically significant and point to coffee having some influence on endocrine function in women as well.
What These Findings Mean
Overall, this Finnish study highlights how multifaceted coffee’s relationship with human health really is. The links to lower fat mass, healthier metabolic markers, and sex specific hormonal patterns help explain why coffee has repeatedly been associated with lower risks of type 2 diabetes and cardiovascular disease. While the study cannot prove that coffee causes these changes, its large sample size and detailed measurements make the findings compelling and worth further exploration.
Finland’s high coffee consumption makes it an ideal place to study long term habits, and the Northern Finland Birth Cohort provides a rich dataset for digging into these associations. Future research will need to identify which compounds in coffee drive these effects and whether similar patterns appear in other populations.
Conclusion
The Finnish study adds additional evidence to the idea that coffee may offer health benefits beyond its energizing effects. Regular coffee drinkers in the study tended to have leaner body composition, better metabolic profiles, and distinct hormonal patterns. More research is needed to understand the underlying biology, but it is becoming increasingly clear that coffee’s role in human health is more complex and potentially more beneficial than we once thought.
Reference
Verroest, L., Jokelainen, J., Choudhary, S., Walkowiak, J., Karhu, T., Palaniswamy, S., Auvinen, J., Järvelin, M.-R., & Herzig, K.-H. (2026). Associations of habitual coffee intake with testosterone and cardiometabolic markers: The Northern Finland Birth Cohort 1966 study. European Journal of Nutrition. https://doi.org/10.1007/s00394-026-04038-z
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