BRS-X(Hormones-PM6) - Androgen-Microbiome Regulation
(Gut Bacteria That Shape Androgen Levels)
1. Mission & Overview
Mission
Shape systemic androgen exposure through microbiome-mediated androgen metabolism and recycling.
Overview
Supports microbiome-mediated regulation of androgen metabolism, degradation, recycling, and systemic androgen exposure through microbial steroid-transforming enzymes and enterohepatic circulation (a male-hormone parallel to the estrobolome pathway covering oestrogen). This mechanism links gut ecology directly to circulating androgen levels, meaning microbial composition can shift systemic exposure independently of gonadal output. Because this pathway feeds directly into testosterone signalling stability, gut-supportive dietary patterns carry downstream relevance for androgen-dependent motivation and effort biology.
- Regulates androgen metabolism and enterohepatic recycling via gut microbes.
- Links microbial composition to circulating androgen levels.
- Feeds directly into testosterone signalling and motivation biology.
2. Primary Biological Effects
↑ androgen metabolic stability; ↑ endocrine-microbiome integration; ↓ dysbiosis-associated endocrine disruption
3. Phenome Connections
These mappings are translational relationships, not single-mechanism outcome claims. Phenomes are emergent functional patterns supported by multiple interacting PMs across the BRAIN Framework. Biology → Phenome Confidence reflects how directly this mechanism's biology would be expected to affect the phenome within BRAIN architecture — not dietary treatment efficacy. Evidence Confidence (below Key References) reflects how convincing the attached evidence is for the Biology → Phenome relationship on that row.
These are three independent scores. They are not combined or averaged. A phenome can have Medium registry evidence while individual mechanism rows show different Biology → Phenome and Evidence scores.
1. Phenome Evidence Confidence (Phenome Registry only)
Question: How convincing is the foundational evidence that this phenome is a valid, well-defined functional construct — and that diet-relevant biology can plausibly connect to it?
Not a roll-up of Biology → Phenome Confidence or Evidence Confidence from Primary Mechanism page rows. Those are scored per mechanism; this score is assigned once per phenome at registry level.
Derived from foundational landmark evidence organised in up to three layers: construct validation, biology→phenome linkage, and nutrition→biology modulation. Each layer may include one or many landmark papers depending on registry review.
2. Biology → Phenome Confidence (Primary Mechanism page §3 rows)
Question: If this PM/FM biology were substantially impaired in isolation, how directly would that phenome be expected to suffer — within BRAIN architecture?
How it is derived: Reviewers read the PM/FM definition and biological function first — initially ignoring attached references and whether dietary intervention studies exist. References are reviewed only when scoring Evidence Confidence (below).
Score levels (the value shown on each row as Biology → Phenome Confidence):
- High — primary biological determinant (e.g. noradrenergic signalling → attention; GABA synthesis → calming tone)
- Medium — major contributory determinant, not the sole driver
- Low–Medium — established but indirect, modulatory, or one integrative step removed
- Low — distal, conditional, or weak biological coupling
“Not dietary treatment efficacy” means this score does not ask whether a diet or supplement treats the phenome. It asks whether the biology itself is architecturally relevant. Limited dietary RCT evidence belongs in Evidence Confidence, not here.
3. Evidence Confidence (Primary Mechanism page §3 rows)
Question: How convincing are the attached Key References on that specific row that this biology actually relates to this phenome?
How it is derived: Assigned after Biology → Phenome Confidence, by reviewing only the references on that PM/FM row. Judges whether refs support the relationship — not just mechanism or phenome in isolation.
- High — strong convergent human evidence directly linking mechanism biology to phenome variation
- Medium — multiple human lines supporting the relationship; may include one bridge study with an inferential step
- Low–Medium — convergent translational stack without direct mechanism↔phenome measurement on the row
- Low — mechanistic or preclinical only; mechanism and phenome supported separately but not bridged
Often equal to or lower than Biology → Phenome Confidence. Can occasionally be higher when outcome evidence is stronger than the mechanism's contributory role.
- Biology → Phenome Confidence: Low
- Rationale: Microbial androgen metabolism may influence systemic androgen availability and indirectly influence motivation-related phenomes.
- Key References:
- Evidence Confidence: Low
- Biology → Phenome Confidence: Low
- Rationale: Microbial androgen metabolism may influence systemic androgen exposure relevant to energy and stamina context; direct ADHD evidence remains limited.
- Key References:
- Evidence Confidence: Low
- Biology → Phenome Confidence: Low
- Rationale: Microbiome-androgen interactions may influence endocrine states relevant to mood and behavioural regulation, but direct ADHD evidence is currently limited.
- Key References:
- Evidence Confidence: Low
4. Levers
Intervention Profile
Intervention Dominance: Diet-Supported
- Fermentable fibre ← oats, legumes, vegetables
- Plant diversity and prebiotic whole foods ← varied vegetables, intact grains, legumes
- fermentable fibre
-
Inulin/GOS ← onions, chicory, legumes
-
Pectin/soluble fibre ← oats, apples, flax seeds
-
Resistant starch ← cooled potatoes, cooled rice, green bananas
1. Food Preparation & Delivery ONLY
- Prepare fermentable staples and include traditionally fermented foods where tolerated — see Lentils — Preparation.
- Soak overnight to reduce phytates and improve mineral bioavailability — see Oats — Preparation.
- Soak before cooking to reduce phytates and improve mineral bioavailability [4]. — see Barley — Preparation.
- Prepare cruciferous vegetables to support myrosinase-dependent sulforaphane yield — see Broccoli Sprouts — Preparation.
- Sleep regularity and stress recovery may support gut ecological stability intersecting endocrine-microbiome coupling.
- Antibiotic overuse and ultra-processed low-fibre patterns may disrupt microbial steroid-metabolising ecology.
5. Mechanistic Basis
Summary
Gut microbial steroid-transforming enzymes and enterohepatic circulation modulate systemic androgen exposure within BRS-X(Hormones-FM1), linking BRS5 microbiome ecology with BRS6 metabolic regulation and BRS3 inflammatory interfaces where dysbiosis disrupts endocrine stability [Leao et al., 2025].
(Steroid-transforming microbial pathways)
Commensal bacteria may metabolise androgens through hydroxysteroid dehydrogenases, desmolase activity, and enterohepatic recycling pathways that alter systemic androgen bioavailability → [Leao et al., 2025]
(Fermentable substrate context)
Fermentable fibre availability supports microbial ecological stability constraining dysbiosis-associated shifts in steroid-metabolising taxa via BRS5(KC1) — Fermentable Fibre Availability.
(Boundaries of the mechanism)
Direct neural testosterone signalling belongs to BRS-X(Hormones-PM5) — Testosterone Signalling Stability. Oestrogen-specific estrobolome recycling belongs to BRS-X(Hormones-PM2) — Estrobolome Regulation.
(Integration within BRS-X(Hormones))
This PM operationalises the androgen-microbiome arm of BRS-X(Hormones-FM1), constrained by BRS5(KC1) — Fermentable Fibre Availability for fermentable substrate support.
5.1 Evidence Highlights
Introduction/Summary
Microbial steroid metabolism and enterohepatic circulation are established gut–endocrine interfaces. The studies below highlight steroid-transforming pathways and fermentable substrate dependence that refine how systemic androgen exposure is interpreted through the microbiome.
- Confidence: low-medium
- Evidence Level: mechanistic
- Rationale: Commensal bacteria may metabolise androgens through hydroxysteroid dehydrogenases, desmolase activity, and enterohepatic recycling pathways that alter systemic androgen bioavailability — shaping systemic androgen exposure through microbial metabolism [Leao et al., 2025].
- Key References:
- Confidence: low-medium
- Evidence Level: mechanistic
- Rationale: Gut microbial steroid-transforming enzymes modulate androgen degradation, recycling, and systemic exposure through enterohepatic circulation — parallel to estrobolome recycling represented in sibling PM2 [Leao et al., 2025].
- Key References:
- Confidence: low-medium
- Evidence Level: mechanistic
- Rationale: Fermentable fibre availability supports microbial ecological stability constraining dysbiosis-associated shifts in steroid-metabolising taxa — dependent on BRS5(KC1) fermentable fibre substrate delivery [Leao et al., 2025].
- Key References:
6. BRS Pathways and Connections
6.1 BRS Pathways
- None listed
6.2 Cross-BRS Mechanism Relationships
Primary Mechanisms in other Biological Regulatory Systems that directly interact with, constrain or support this mechanism.
- BRS-X(Hormones-FM1) — Reproductive Hormone Balance & Neurocognitive Regulation — bRS-X(Hormones-FM1) — Reproductive Hormone Balance & Neurocognitive Regulation
- BRS-X(Hormones-PM2) — Estrobolome Regulation — bRS-X(Hormones-PM2) — Estrobolome Regulation
- BRS-X(Hormones-PM5) — Testosterone Signalling Stability — bRS-X(Hormones-PM5) — Testosterone Signalling Stability
- BRS1(FM1) — Monoaminergic Function — Gut-mediated oestrogen recycling
- BRS5-FM2-PM5 — SCFA Production & Signalling — sCFA Production & Signalling
- BRS5(FM1) — Gut Barrier Integrity & Immune Interface — gut Barrier Integrity & Immune Interface
- BRS6(FM1) — Glycaemic–Insulin Stability & Cognitive Energy Availability — Direct oestrogen neural signalling
6.3 Local BRS Mechanism Relationships
Related Primary Mechanisms within the same Biological Regulatory System that collectively support the integrated biological function.
- BRS-X(Hormones-PM5) — Testosterone Signalling Stability
- BRS-X(Hormones-PM2) — Estrobolome Regulation