The Study
Effects of Resistant Starch on Metabolic Markers and Gut Microbiota in Women with Metabolic Syndrome Risk Factors: A Randomized, Double-Blind, Pilot Study
This study is like a mini experiment where 30 women ate either a special high-fiber snack or a normal one for 8 weeks. It found that the high-fiber snack made some health numbers go up (like fat and triglycerides), but it doesn’t prove the snack caused it — just that they happened together in this small group.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
This study tested if eating more resistant starch — a type of fiber that doesn’t get digested — helps or hurts metabolism in women at risk for metabolic syndrome.
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 561 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Even though they didn’t eat more calories, their bodies made more fat and blood fats — which could raise heart disease risk — while also lowering blood pressure a bit.
- 2After 8 weeks of eating 7.9 grams of resistant starch daily, women gained about 1 kg in weight and their triglycerides rose by 40 mg/dL, but their blood pressure went down a little.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Nutrients
Year
2025
Authors
Kyu-Nam Kim, Min‐Sook Kang, Nam-Seok Joo, Hyang-Rae Lee, Susie Jung, Seyoung Ju, Yong-Ju Lee, Kyucheol Lee, S. Jung, Jisoon Im, Jiyoung Lee
Related Content
Claims (6)
Some types of starch pass through the small intestine without being broken down, so no glucose is absorbed from them.
In middle-aged women with metabolic syndrome risk factors, consuming high amounts of resistant starch for 8 weeks does not change the overall diversity of gut bacteria, but it does change the abundance of certain bacterial species.
Middle-aged women with metabolic syndrome risk factors who consume high amounts of resistant starch for 8 weeks experience a small but measurable decrease in systolic blood pressure, even when their weight and calorie intake do not change.
In middle-aged women with metabolic syndrome risk factors, eating less resistant starch is linked to higher levels of the gut bacteria Marvinbryantia, which correlates with stable lipid levels and more butyrate, while eating more resistant starch is linked to higher levels of Veillonella and increased triglycerides.
In middle-aged women with metabolic syndrome risk factors, consuming 7.9 grams of resistant starch daily for 8 weeks results in a 40 mg/dL increase in serum triglycerides and a 1.0 kg increase in body weight, without changes in total caloric intake.
In middle-aged women with metabolic syndrome risk factors, consuming high amounts of resistant starch for 8 weeks is associated with higher levels of the gut bacterium Veillonella, which is linked to increased triglycerides and body fat due to greater production of acetate and propionate that promote fat synthesis in the liver.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.