Coffee linked to lower fat, more muscle, hormone shifts — SkimNews
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- University of Oulu researchers analyzed 2,264 46-year-olds from the Northern Finland Birth Cohort 1966, finding higher coffee intake associated with lower total and visceral fat plus greater skeletal muscle mass, despite similar BMIs across intake levels.
- Higher coffee consumption was linked to lower circulating branched-chain amino acids in both sexes — biomarkers previously tied to insulin resistance and elevated type 2 diabetes risk.
- Men who drank more coffee showed a more favorable glucose-insulin profile, higher total and bioavailable testosterone, and greater sex hormone-binding globulin (SHBG), though free testosterone and the free androgen index were modestly lower.
- Women showed a narrower hormonal footprint — mainly increased SHBG and lower free androgen measures — with fewer metabolic associations than men.
- Lead author Luca Verroest, a Doctoral Researcher at Oulu, said the hormonal signature "didn't disappear even after we took into account BMI and lifestyle factors," with several associations differing between sexes.
- Published in the European Journal of Nutrition, the study was observational and cannot establish that coffee caused the differences; researchers are now testing the questions in animal models ahead of potential human intervention studies.
- Finland ranks among the world's top coffee-consuming countries at roughly 11.8 kg per person annually, making the cohort setting especially relevant to coffee-health research.
Why it matters: For a country and a world that drinks enormous amounts of coffee, the study points to specific biological channels — branched-chain amino acids, SHBG, androgens — that may explain why coffee consumption keeps correlating with lower rates of type 2 diabetes and cardiovascular disease. Because the research is observational, it cannot justify prescribing coffee, but it gives researchers concrete hormonal and metabolic targets to chase in the animal studies already underway.
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