Metabolic & Cardiometabolic
Does resistant starch lower blood sugar after a meal?
The claim, precisely: resistant starch decreases postprandial glucose
Strong support Metabolic & Cardiometabolic
RefutedContestedStrong support
consensus score 1.00
Yes for the post-meal spike, but its longer-term fasting effect is small and needs fairly large daily doses.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
MechanismIn-vitroAnimalObservationalRCTMeta-analysis
How the studies fall
3 support 0 contradict 0 tested null 0 mixed · 3 sources, 3 independent groups
What the evidence shows
Resistant starch (esp. high-amylose wheat RS2) lowers the acute postprandial glucose/insulin response; chronic fasting-glucose effect is small and dose-hungry (>28 g/d).
The evidence (3)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Xiong K, et al. 2021 · Br J Nutr | meta-analysis | supports | moderate | Fasting glucose -0.09 mmol/L (-0.16 at >28 g/d); HOMA-IR -0.33; fasting insulin NS |
| Di Rosa C, et al. 2023 · Nutrients | RCT | supports | low | HA bread/biscuits (~12% starch as RS) significantly lower GI; n=10 |
| Belobrajdic DP, et al. 2019 · Nutrients | RCT | supports | moderate | High-amylose wheat bread lowered postprandial glycemic response vs conventional |
Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.