Gut & Microbiome
Is one gut microbe key to digesting resistant starch?
The claim, precisely: Ruminococcus bromii enables resistant starch fermentation
Strong support Gut & Microbiome 🐭 Non-human evidence
RefutedContestedStrong support
consensus score 1.00
Yes, it's the essential first responder, though shown mainly in lab work rather than whole-person trials.
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: Cells in a dish (In-vitro)
MechanismIn-vitroAnimalObservationalRCTMeta-analysis
How the studies fall
6 support 0 contradict 0 tested null 0 mixed · 4 sources, 4 independent groups
What the evidence shows
R. bromii is the keystone primary degrader of resistant starch; absent it, RS is poorly fermented. Spiking it into low-R.bromii communities restores RS3 fermentation — the molecular basis of RS responder/non-responder status.
The evidence (6)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Pickens JT, Cockburn DW 2024 · mSphere | mechanism | supports | moderate | RS-degradation is a rare, patchily-distributed trait — basis of inter-individual non-response |
| Ze X, et al. (Flint lab) 2012 · ISME J | in-vitro | supports | high | [FT-verified] Ze/Flint 2012 ISME-J founding R.bromii keystone RS degrader. IN-VITRO/ex-vivo |
| Ze X, et al. (Flint lab) 2012 · ISME J | in-vitro | supports | high | R. bromii uniquely stimulated RS2/RS3 use by other species; spiking restored RS3 fermentation in deficient donors |
| Pickens JT, Cockburn DW 2024 · mSphere | in-vitro | supports | moderate | [FT-verified] mSphere 2023 RS-degradation rare trait (R.bromii/B.adolescentis). IN-VITRO |
| Cerqueira 2022 · J Biol Chem | in-vitro | supports | moderate | [FT-verified] JBC 2022 Sas20 starch-binding in amylosome. IN-VITRO/mechanism |
| Ze 2015 · mBio | in-vitro | supports | moderate | [FT-verified] mBio 2015 R.bromii amylosome/GH13 for particulate RS. IN-VITRO/mechanism |
Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.