Observational study finds higher coffee intake linked to reduced body fat and increased muscle mass — Evidence Review
Published in European Journal of Nutrition, by researchers from University of Oulu
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Table of Contents
Habitual coffee consumption is linked to lower body fat, higher muscle mass, and distinct hormonal patterns, with differences observed between men and women according to a recent University of Oulu study. Related research generally supports these findings, showing associations between coffee or caffeine intake and improved body composition and metabolic markers, though causality remains unproven.
- Several randomized controlled trials and meta-analyses have found that increased caffeine or coffee intake may modestly reduce body weight, body fat, and central adiposity, particularly in men, aligning with the new study’s observations of leaner body composition among coffee drinkers 1 2 4 6.
- Multiple cross-sectional and intervention studies report positive associations between coffee consumption and skeletal muscle mass, supporting the new study’s finding of higher muscle mass in habitual coffee drinkers 7 8 9.
- Research on coffee’s effects on sex hormones and hormone-binding proteins shows mixed results, with some studies suggesting modest increases in sex hormone-binding globulin (SHBG) and shifts in sex hormone profiles, paralleling some of the sex-specific hormonal associations seen in the new study 12 13 14.
Study Overview and Key Findings
Coffee is one of the world’s most widely consumed beverages, yet its biological impacts remain incompletely understood. While previous research has linked coffee drinking to reduced risk of metabolic diseases, the mechanisms—especially those involving body composition and hormonal changes—are not fully clear. This new observational study from the University of Oulu adds important detail by examining a large, population-based cohort, specifically focusing on metabolic and hormonal profiles and how these associations differ between men and women.
| Property | Value |
|---|---|
| Study Year | 2026 |
| Organization | University of Oulu |
| Journal Name | European Journal of Nutrition |
| Authors | Luca Verroest, Jari Jokelainen, Shalini Choudhary, Jaroslaw Walkowiak, Toni Karhu, Saranya Palaniswamy, Juha Auvinen, Marjo-Riitta Jarvelin, Karl-Heinz Herzig, Ghulam Shere Raza |
| Population | People aged 46 from Northern Finland Birth Cohort 1966 |
| Sample Size | n=2264 |
| Methods | Observational Study |
| Outcome | Body composition, metabolic markers, sex hormones |
| Results | Higher coffee intake linked to less body fat and more muscle mass. |
In this study, researchers analyzed data from 2,264 middle-aged adults to assess whether regular coffee intake was associated with differences in body composition, metabolic markers, and sex hormone profiles. They found that individuals who consumed more coffee had less total and visceral fat and greater skeletal muscle mass, despite similar BMI to those who drank less coffee. Notably, the study also identified sex-specific differences in hormone profiles associated with coffee consumption, particularly among men. However, because the study was observational, it cannot determine whether coffee causes these differences.
Literature Review: Related Studies
To contextualize these findings within the broader scientific landscape, we searched the Consensus paper database, which includes over 200 million research papers. The following queries were used to identify relevant studies:
- coffee intake body fat relationship
- coffee effects muscle mass comparison
- hormonal changes coffee consumption impact
Summary Table of Key Topics and Findings
| Topic | Key Findings |
|---|---|
| Does coffee consumption affect body fat and adiposity? | - Caffeine and coffee intake are associated with modest reductions in body weight, BMI, and fat mass, particularly in men 1 2 4 6. - Some studies show that coffee with added sugar and creamer may be associated with higher obesity risk, highlighting the importance of coffee preparation methods 5. |
| What is the relationship between coffee intake and skeletal muscle mass? | - Habitual coffee consumption is positively associated with skeletal muscle mass, and may be inversely linked to low muscle mass prevalence in various populations 7 8 9. - Experimental studies in animals suggest that components in coffee may inhibit muscle atrophy and promote muscle growth 10. |
| How does coffee consumption influence sex hormones and binding proteins? | - Coffee and caffeine intake may alter profiles of sex hormones and SHBG, with some studies finding increases in SHBG and changes in testosterone/estrogen levels, though effects are generally modest and sometimes inconsistent 12 13 14 15. - Clinical and laboratory studies have documented that coffee compounds can influence hormone receptor activity and metabolism, but findings vary by sex and other factors 11. |
| What are the metabolic and inflammatory effects of coffee? | - Regular coffee consumption is associated with favorable profiles of several metabolic and inflammatory biomarkers, such as lower C-peptide, leptin, and CRP, and higher adiponectin, potentially contributing to reduced chronic disease risk 14. - Coffee’s effects on metabolic pathways may help explain its association with lower risk of type 2 diabetes and cardiovascular disease 14. |
Does coffee consumption affect body fat and adiposity?
The new study’s finding that higher coffee intake is linked to lower total and visceral body fat is supported by several randomized controlled trials and meta-analyses, which generally report modest reductions in fat mass and BMI with increased caffeine or coffee consumption. However, results vary by sex, preparation method, and population.
- Meta-analyses of randomized controlled trials report that caffeine intake promotes reductions in weight, BMI, and body fat, with benefits increasing with higher consumption 1.
- Observational studies suggest a modest inverse association between coffee intake and measures of adiposity, particularly in men 2.
- Regular consumption of coffee high in chlorogenic acids may reduce abdominal/visceral fat in overweight adults 4.
- Coffee with added sugar and non-dairy creamer, as commonly consumed in Korea, may be associated with higher obesity risk, illustrating how preparation methods can influence outcomes 5.
What is the relationship between coffee intake and skeletal muscle mass?
The observed association between higher coffee consumption and greater skeletal muscle mass in the new study is echoed in several large cohort studies and experimental research. These studies consistently find that habitual coffee drinking is linked to higher muscle mass and lower prevalence of low muscle mass.
- Cross-sectional studies from Japan and the U.S. find a positive association between coffee consumption and skeletal muscle mass, independent of inflammation or other confounders 7 8 9.
- Animal studies have identified specific coffee compounds, such as those found in coffee silverskin, that may inhibit myostatin activity and promote muscle growth 10.
- Coffee’s positive association with muscle mass is more pronounced in populations at risk for sarcopenia or low muscle mass 9.
How does coffee consumption influence sex hormones and binding proteins?
The new study’s identification of sex-specific hormonal signatures among coffee drinkers is partly reflected in the literature, though findings across studies are mixed and often modest in scale. Research shows that coffee and caffeine may influence sex hormone and SHBG levels, with some differences by sex and menopausal status.
- Some randomized trials and cross-sectional studies report that coffee or caffeine intake increases SHBG and alters testosterone/estradiol levels, especially in women 12 13 14.
- The impact on hormonal profiles is often modest, sometimes transient, and may differ by coffee type (caffeinated vs. decaffeinated) and sex 12.
- Coffee compounds may interact with hormone receptors or influence hormone metabolism, as observed in laboratory studies of breast cancer cells 11.
- Patterns of estrogen metabolism in premenopausal women are influenced by caffeine and coffee intake, potentially affecting cancer risk 15.
What are the metabolic and inflammatory effects of coffee?
The new study’s findings on lower branched-chain amino acids and improved metabolic markers among coffee drinkers are consistent with prior research indicating that coffee consumption is associated with favorable profiles of multiple biomarkers linked to metabolic health and inflammation.
- Large cohort studies in U.S. health professionals show that higher coffee intake is associated with lower levels of C-peptide, insulin-like growth factor binding protein, leptin, CRP, and inflammatory cytokines, and higher adiponectin 14.
- These metabolic benefits are thought to underlie the reduced risk of type 2 diabetes and cardiovascular disease seen in habitual coffee drinkers 14.
Future Research Questions
While the evidence linking coffee consumption to favorable body composition, metabolic profiles, and hormonal changes is growing, causality has not been established, and important questions remain. Further research—including long-term interventional studies and mechanistic investigations—is needed to clarify these associations and their implications for health.
| Research Question | Relevance |
|---|---|
| Does long-term coffee consumption cause lasting changes in body composition and muscle mass? | Understanding causality is essential, as most current evidence is observational or short-term; long-term randomized trials are needed to determine sustained effects 1 6 9. |
| Which coffee compounds are most responsible for metabolic and hormonal effects? | Identifying specific bioactive components (e.g., caffeine, chlorogenic acids, other phytochemicals) could help tailor dietary recommendations and understand mechanisms 4 6 10. |
| How do sex and genetic factors modify the relationship between coffee intake and hormone levels? | The new study and others report sex-specific effects; genetic and hormonal differences may alter individual responses to coffee 12 13 14. |
| Do different coffee preparation methods or additives (sugar, creamer) change the health impact? | Some studies show that coffee with sugar and creamer may increase obesity risk, underscoring the importance of preparation and consumption patterns 5. |
| Can changing coffee intake improve metabolic health markers in high-risk populations? | Interventional studies in populations at risk for metabolic disease or sarcopenia are needed to assess whether modifying coffee consumption can have clinical benefits 4 9 14. |