The Study
The acute effects of inulin and resistant-starch on postprandial serum short-chain fatty acids and second-meal glycaemic response in lean and overweight humans
This study tested what happens right after people drink drinks with different kinds of fiber. It found that one fiber made more gut gases and another made blood sugar drop better — but it didn’t prove that one fiber causes better health. It just showed what happened in the few hours after drinking.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Two types of fiber — inulin and resistant starch — were tested to see if they help control blood sugar after meals by making gut-friendly acids.
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 554 / 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.
- 1Yes — resistant starch improved blood sugar control without relying on gut acids, suggesting a different, more effective mechanism.
- 2Inulin made gut acids (SCFA) rise quickly but didn't lower blood sugar.
- 3Resistant starch didn't raise SCFA much but lowered blood sugar by 15–20% and reduced fat rebound in blood.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
European journal of clinical nutrition
Year
2016
Authors
Sari Rahat-Rozenbloom, J. Fernandes, Ji Cheng, G. Gloor, T. Wolever
Related Content
Claims (6)
When healthy lean and overweight adults consume 24 grams of inulin with a glucose drink, their blood levels of acetate, propionate, and butyrate rise within 4 to 6 hours, but their blood sugar and insulin levels after the next meal are not lower than when they do not consume inulin.
Consuming 28 grams of resistant starch with a 75-gram glucose load reduces postprandial glucose and insulin levels by 15–20% during a subsequent meal in healthy lean and overweight adults, regardless of changes in serum short-chain fatty acids.
In healthy adults, consuming resistant starch reduces the rise in free fatty acids after a meal containing glucose, while inulin does not, and this reduction is linked to better blood sugar control at the next meal, suggesting free fatty acid changes are more important than short-chain fatty acid changes for metabolic regulation.
When healthy lean and overweight people eat inulin or resistant starch in a single meal, their blood levels of short-chain fatty acids rise by the same amount afterward.
When healthy adults consume inulin, it quickly produces short-chain fatty acids and hydrogen gas in the colon within 2 to 5 hours. Resistant starch produces these same compounds more slowly and in smaller amounts.
The human digestive system cannot break down dietary fiber to produce short-chain fatty acids that provide energy, so dietary fiber contributes no calories.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.