New research from Finland suggests that regular consumption of the popular caffeinated beverage may be linked to a leaner physique and more favorable metabolic markers.
Study design and key findings
The investigation, carried out by the University of Oulu, examined 2,264 participants who were all 46 years old and part of the Northern Finland Cohort. Researchers looked at body composition, circulating metabolites, cardiometabolic risk factors and sex hormones.
Even though body-mass index was similar across groups, those who reported higher intake showed lower total and visceral fat and greater skeletal muscle mass. Men with higher consumption also displayed a more favorable glucose-insulin profile and higher total and bioavailable testosterone, while free testosterone and the free androgen index were reduced. Women showed fewer hormonal changes, primarily higher sex hormone-binding globulin and lower free androgen levels.
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Both sexes had lower circulating levels of branched-chain amino acids, metabolites that have been associated with insulin resistance. The authors noted that these hormonal patterns persisted after adjusting for BMI and lifestyle variables.
Expert commentary and cautions
Luca Verroest, lead author and doctoral researcher at the university, said the distinct hormonal signature stood out in the analysis. “The data kind of sits there, waiting for a coffee lover’s optimism,” he added, emphasizing that the associations remained after statistical controls.
Wesley Buckle, a licensed naturopathic doctor, warned that the study’s observational nature limits conclusions about cause and effect. “I don’t think that people should increase their coffee intake based just on this study,” he said. “There’s a large body of research that suggests moderate consumption may be associated with favorable metabolic outcomes, but that isn’t evidence that the drink itself is what causes these outcomes.”
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Charles Smith, medical director of a health organization, echoed the need for restraint. “The study provides assurance that moderate consumption can complement a healthy lifestyle, without providing a rationale for increased intake in hopes of losing fat or improving insulin sensitivity,” he explained. “In short, coffee should not be considered a metabolic therapy.”
Ayesha Bryant, a clinical advisor, highlighted the value of looking beyond BMI. “Although there were no statistically significant differences in BMI between the two groups, there were significantly stronger positive associations between drinking habits and leaner body compositions,” she noted. “Moderate amounts of unsweetened or minimally sweetened coffee can represent an acceptable part of a healthy diet.”
