A recent study from Finland has found associations between regular coffee drinking and beneficial changes in body composition and hormone levels. The research, published in the European Journal of Nutrition, involved 2,264 participants aged 46 and explored how coffee consumption relates to body fat, muscle mass, metabolism, and sex hormones.

Key Findings

  • Higher coffee intake correlated with lower total and visceral fat, the latter being fat stored around internal organs.
  • Participants who drank more coffee showed greater skeletal muscle mass, independent of body mass index (BMI).
  • Coffee consumers exhibited lower blood levels of certain amino acids linked to insulin resistance and increased type 2 diabetes risk.
  • Among men, increased coffee consumption was associated with improved glucose and insulin profiles, higher total and bioavailable testosterone, and elevated sex hormone-binding globulin (SHBG) levels.
  • In women, coffee intake was mainly connected to higher SHBG and reduced free androgen levels.

Interpretation and Limitations

Researchers caution that the study's observational design cannot confirm that coffee causes these physiological differences. Other lifestyle or dietary factors may contribute to the associations observed. The hormonal effects varied between men and women and persisted after adjusting for BMI and lifestyle factors, suggesting a potential link between coffee and metabolic and hormonal processes.

Despite these findings, experts emphasize that more research, including controlled human trials, is necessary to understand whether coffee directly influences body composition, metabolism, or hormone levels. Current evidence does not support recommending increased coffee consumption solely for weight loss or diabetes prevention.

Context in Existing Research

Previous studies have also linked moderate coffee intake to reduced risk of type 2 diabetes and cardiovascular diseases, though the biological mechanisms remain unclear. The Finnish study adds to this body of evidence by highlighting specific hormonal and metabolic markers associated with habitual coffee drinking.