Coffee Linked to Body Composition, Hormone Shifts
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- University of Oulu researchers analyzed data from 2,264 people aged 46 in the Northern Finland Birth Cohort 1966, finding higher coffee intake linked to lower total and visceral fat and greater skeletal muscle mass despite similar BMIs across intake groups.
- Higher coffee consumption was associated with lower circulating branched-chain amino acids — biomarkers previously tied to insulin resistance and type 2 diabetes risk — in both men and women.
- Male coffee drinkers showed a more favorable glucose-insulin profile, higher total and bioavailable testosterone, and higher SHBG levels, though free testosterone and the free androgen index were modestly lower.
- Female coffee drinkers showed mainly increased SHBG and lower free androgens, with less extensive hormonal associations than men, lead author Luca Verroest said.
- Verroest, a Doctoral Researcher at the University of Oulu, said the hormonal signature persisted even after adjusting for BMI and lifestyle factors, with several associations differing between sexes.
- The study, published in the European Journal of Nutrition, was observational and cannot establish causation; researchers say they are pursuing animal models before any potential human intervention trials.
- Finland ranks among the world's top coffee consumers at roughly 11.8 kg per person annually — about 26 pounds — making the cohort a particularly high-exposure setting for studying coffee's metabolic footprint.
Why it matters: For the millions of daily coffee drinkers, the study offers biological clues — not yet dietary advice — about why earlier research linked coffee to lower type 2 diabetes and cardiovascular risk. Researchers caution the correlations cannot guide recommendations until intervention trials clarify whether coffee itself drives the metabolic and hormonal shifts.
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