Coffee drinkers show less fat, more muscle and surprising hormone differences
New research from Finland reveals the effects of regular coffee consumption on body composition and hormone levels.
1The unknown effects of coffee
Coffee consumed daily worldwide was known to reduce the risk of type 2 diabetes and cardiovascular disease. However, the biological processes explaining these connections were not fully understood. New research from Finland shows that regular coffee intake has significant effects on body composition, metabolic markers, and sex hormones. The study analyzed data from 2,264 participants aged 46 from the Northern Finland Birth Cohort 1966.
2Less fat, more muscle
According to the results, individuals who consumed more coffee had lower levels of both total body fat and visceral fat. At the same time, their skeletal muscle mass was higher. Interestingly, these differences were observed despite participants with high and low coffee intake having similar body mass index (BMI). These findings suggest that coffee may have effects on fat and muscle distribution independent of BMI.
3Improvement in metabolic markers
The study found that higher coffee consumption was associated with lower concentrations of branched-chain amino acids in both men and women. These biomarkers, when chronically elevated, have previously been linked to increased insulin resistance and risk of developing type 2 diabetes. The findings provide new insights into coffee's potential protective effects on metabolic health.
4Pronounced hormonal changes in men
The most striking results were observed in men. Men who consumed more coffee showed a more favorable glucose-insulin profile, higher total and bioavailable testosterone levels, and increased sex hormone-binding globulin (SHBG) concentrations. However, free testosterone and the free androgen index were slightly lower. These hormonal changes demonstrate coffee's complex effects on male metabolism.
5Different hormone effects in women
Hormonal associations were more limited in women. Higher coffee consumption was mainly linked to increased SHBG and lower measures of free androgens. Researchers note that these differences suggest coffee has sex-specific metabolic effects. The findings showed that these hormonal signatures persisted even after controlling for BMI and lifestyle factors.
6Hormones may play a key role
According to lead author Luca Verroest, hormones may play a pivotal role in explaining the connections between coffee consumption and metabolic health. However, as the study was observational, it cannot prove that coffee consumption directly causes these biological differences. Finland being one of the world's highest coffee-consuming countries (11.8 kg per capita annually) makes the findings particularly significant.
7Paving the way for future research
The findings set the stage for new studies to determine whether coffee itself causes these biological changes and which compounds might be responsible. Scientists are currently investigating these questions using animal models, with the long-term goal of moving to human intervention studies. However, additional research will be needed before dietary recommendations can be shaped.
8Study rethinks coffee-health relationship
This comprehensive study provides new information about the health effects of coffee, an indispensable part of our daily lives. Particularly, the sex-specific effects on body composition and hormone levels open new doors in understanding coffee's connection with metabolic health. However, more clinical studies are needed to draw definitive conclusions.