BRS5(FM2) - Microbial Metabolite Signalling Capacity
1. Definition
Functional control point governing production of beneficial microbial metabolites that shape immune, endocrine, and neurobiological signalling.
2. Intervention Breakdown
Food-State Dominant
3. Functional Role
↑ SCFA signalling; ↑ polyphenol biotransformation; ↑ metabolite-mediated gut-brain communication
4. Mechanistic Basis (Implementation of PMs)
Integrated control of microbial ecological selection, SCFA output, and downstream biotransformation of diet-derived compounds into signalling metabolites.
PM1 governs Microbial Ecological Turnover & Competitive Selection. PM2 governs SCFA Production & Signalling. PM8 governs Polyphenol Biotransformation & Mitochondrial-Relevant Metabolite Generation.
Together, these PMs operationalise BRS5(FM2) as coordinated microbial metabolite signalling capacity.
At the integrated FM level, this is the main mechanism set through which plant diversity, fermentable fibres, and microbiome-active polyphenols are translated into downstream physiological effects, rather than remaining as unprocessed dietary inputs [1][2][3].
5. Underlying Mechanisms and Requirements
5.1 Cofactors and Substrates
| PM | Cofactors | KC substrates |
|---|---|---|
| BRS5(PM1) | fermentable fibre, polyphenols, circadian regularity | fermentable fibres and resistant starch (KC1); microbiome-active polyphenols and plant diversity (KC2) |
| BRS5(PM2) | fermentable fibre, microbial diversity | fermentable fibres and resistant starch (KC1) |
| BRS5(PM8) | polyphenols, microbial diversity | microbiome-active polyphenols and plant diversity (KC2) |
5.2 PMs (Primary Mechanisms)
- BRS5(PM1) - Microbial Ecological Turnover & Competitive Selection
- BRS5(PM2) - SCFA Production & Signalling
- BRS5(PM8) - Polyphenol Biotransformation & Mitochondrial-Relevant Metabolite Generation
5.3 KCs (Key Constraints)
- BRS5(KC1) - Fermentable Fibre Availability
- BRS5(KC2) - Polyphenol & Plant-Diversity Input Availability
5.4 Cross-BRS Links
6. Dietary Levers
Diet
- Fermentable fibres ← legumes, oats, apples, onions, resistant starch sources
- Microbiome-active polyphenols ← berries, green tea, cocoa, pomegranate
- Broad plant diversity ← varied whole-plant pattern
7. Lifestyle Levers
Lifestyle
- Daily repeated exposure matters more than occasional high-polyphenol or fibre spikes.
- Responder variability should be expected because microbial conversion capacity differs across individuals.
8. Scoreable Inputs & Modulation Signals
These inputs are used within the BRAIN Diet ontology to generate evidence-constrained estimates of plausible BRS5 support. They are not direct measures of clinical efficacy.
Scoreable Input Categories
| Input Category | Example Inputs | Functional Relevance |
|---|---|---|
| Functional Property Potentials | fermentable_fibre_density; microbiome_active_polyphenols; plant_diversity | May support microbial metabolite signalling capacity. |
| Realised Functional States | prebiotic_rich_meal; polyphenol_rich_pattern; diversity_supported_ecology | Represent practical metabolite-supportive states. |
| Substance / Nutrient Signals | inulin; GOS; polyphenols; ellagitannins | Substrate signals linked to this FM cluster. |
| Preparation Transformations | cooling_starches; minimally_processed_polyphenol_matrix | May preserve relevant fermentation and biotransformation inputs. |