The Study
Plant-based diet quality and gut microbiota in relation to cardiometabolic risk in Korean adults
This study looked at what people ate and how healthy they were at the same time, like taking a snapshot. It found that people who ate more healthy plants tended to have better gut bacteria and lower obesity risk, but we don’t know if eating those foods made them healthier—or if healthier people just chose to eat better.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
This study looked at what Koreans ate and what bacteria lived in their guts to see if eating more healthy plants (like veggies and whole grains) helps prevent obesity and high blood sugar.
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 544 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — eating more whole plants may help your gut and lower your risk of metabolic problems, while eating lots of sugary plant foods may hurt your metabolism.
- 2People who ate more healthy plants had 28% lower chance of being obese and more diverse gut bacteria.
- 3Those who ate more sugary refined plants had 23% higher chance of high blood sugar and 35% higher chance of low 'good' cholesterol.
- 4Gut bacteria added a little extra info to predict obesity and blood sugar, but doctors' tests were still better.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
European Journal of Nutrition
Year
2026
Authors
Ji-Hee Shin, Eun-Ji Song, Mi Young Lim, Hye-Jo Choi, Jihye Kim, Young-Do Nam
Related Content
Claims (5)
People who eat 30 or more different types of plants each week have higher gut microbiota diversity than those who eat fewer.
Korean adults who eat more whole grains, fruits, vegetables, nuts, and legumes have a 28% lower risk of obesity and higher gut microbiota diversity.
Korean adults who consume more refined grains and added sugars as part of their diet have higher levels of fasting glucose, lower levels of HDL cholesterol, and less diverse gut bacteria compared to those who consume less of these foods.
In Korean adults, combining gut microbiome data with plant-based diet scores improves prediction of obesity and high fasting glucose levels compared to diet scores alone, but clinical markers such as blood pressure and cholesterol remain more accurate predictors.
In Korean adults, eating more healthful plant-based foods is linked to higher levels of the gut bacteria Roseburia and lower levels of Caproiciproducens, while eating more unhealthful plant-based foods is linked to higher levels of Escherichia/Shigella and Veillonella.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.