The Study
A scoping review of the health effects of fermented foods in specific human populations and their potential role in precision nutrition: current knowledge and gaps
This study didn't test fermented foods on people directly—it looked at lots of other studies that did. It found that people who eat yogurt or kimchi sometimes seem healthier, but it's not clear if the food is the reason. Other things like diet, genes, or lifestyle might be what's really making the difference.
Analysis score
Maximum 85 for a systematic review.
Where the score came from
This study looked at why eating yogurt and other fermented foods like kefir and kimchi helps some people feel better or lose weight, but doesn’t help others at all.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 560 / 100
Quality score
Systematic reviews and meta-analyses of cohort studies. They sit above a single cohort study but below a single randomized trial, because the underlying evidence is still observational.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — if you're overweight or have metabolic issues, adding diverse fermented foods to your diet may help your gut and reduce inflammation.
- 2If you're already healthy, it might not make a difference.
- 3People with obesity or metabolic problems saw less inflammation, better gut health, and less weight gain when they ate yogurt or other fermented foods.
- 4People with normal weight didn’t see these benefits.
- 5Their gut bacteria and genes (like LCT and PPAR-γ2) also determined if they responded.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Frontiers in Nutrition
Year
2025
Authors
Christèle Humblot, P. Alvanoudi, Emilia Alves, Ricardo Assunção, Miona Belović, Tuğçe Bulmus-Tuccar, Christophe Chassard, M. Derrien, Mustafa Fevzi Karagöz, S. Karakaya, M. Laranjo, F. Mantzouridou, Catarina Rosado, S. Pracer, Helen Saar, Julien Tap, P. Treven, Guy Vergères, Eugenia Pertziger, I. Savary-Auzeloux
Related Content
Claims (6)
In obese individuals, especially men, eating yogurt is linked to a lower risk of metabolic syndrome and less weight gain over time. This link is not observed in people with normal weight.
People with different versions of the RXRA, PPAR-γ2, and LCT genes respond differently to eating yogurt and cheese, resulting in distinct metabolic and disease-related outcomes.
People's blood sugar responses to bread differ based on their gut bacteria, and the ratio of Prevotella to Bacteroides bacteria can predict how much their blood sugar rises after eating bread.
People who eat a variety of fermented foods like yogurt, kefir, kimchi, and kombucha have higher gut microbial diversity and lower levels of systemic inflammation.
People who consume fermented dairy products have lower levels of specific blood markers linked to systemic inflammation, especially if they are obese and have metabolic dysfunction.
People who have certain gut bacteria, Faecalibacterium prausnitzii and Bacteroides, experience better gut barrier function and less gas after consuming fermented milk products, while those without these bacteria do not.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.