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If coffee powers your mornings, a new Finnish study may add another reason to sip slowly: regular drinkers showed a pattern of less body fat and more muscle mass than non-drinkers.
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Researchers at the University of Oulu analyzed data from more than 2,200 adults to explore links between daily coffee habits and body composition. The team found clear associations between higher coffee consumption and a slimmer, more muscular profile.
How the research was carried out
Participant screening and questionnaires
- More than 2,200 people answered detailed surveys on diet, exercise, medications and medical diagnoses.
- Participants reported how many cups of coffee they drank daily, from none to five or more.
- The study did not capture cup size, brewing method, or whether milk or sugar were added.
Clinical measurements and metabolic tests
- Subjects fasted overnight and avoided coffee before arriving.
- Investigators measured fat and muscle using body composition tests.
- Blood samples were taken and participants drank a glucose solution to assess sugar handling over two hours.
Key results: Body fat, muscle and visceral fat
The strongest pattern showed that people who drank more coffee tended to have:
- Lower total body fat
- Greater skeletal muscle mass
- Less visceral fat, the abdominal fat linked to heart disease and metabolic problems
These are associations, not proof that coffee causes fat loss or muscle gain.
Metabolic signals: BCAAs and insulin links
Alongside body composition, the team looked at blood metabolites. Higher coffee intake was associated with lower levels of three branched-chain amino acids.
- Leucine
- Isoleucine
- Valine
Chronically elevated levels of these amino acids have been tied to insulin resistance and a greater risk of Type 2 diabetes. The study found lower BCAA levels in higher coffee consumers, but could not prove coffee was the cause.
Men and women experienced different metabolic responses
Sex-specific differences emerged in the analysis.
- Men who drank more coffee tended to have lower fasting insulin and reduced insulin responses.
- Women showed fewer and weaker links between coffee intake and glucose control.
- In some men, higher coffee consumption correlated with higher levels of certain cholesterol-carrying lipoproteins and lower omega-3 fat measures.
These mixed signals show that coffee’s health relationships may vary by sex and other factors.
What the authors emphasize about interpretation
Study lead author Luca Verroest highlighted that millions drink coffee, yet its metabolic effects are still not fully mapped. The research revealed a distinct hormonal and metabolic pattern linked to coffee that persisted after adjusting for BMI and lifestyle.
Still, the investigators caution that their findings reflect correlations. They do not demonstrate that coffee directly lowers BCAAs, strips fat, or builds muscle.
