BRS4(FM3) - Substrate Utilisation Flexibility
1. Definition
Functional control of mitochondrial capacity to use fatty acids and mixed substrates efficiently under changing metabolic demand.
2. Intervention Breakdown
Food-State Dominant
3. Functional Role
↑ fatty-acid oxidation flexibility; ↑ metabolic adaptability
4. Mechanistic Basis (Implementation of PMs)
Integrated control of mitochondrial fuel switching and long-chain fatty-acid utilisation under changing energetic conditions.
PM7 governs Carnitine-Mediated Fat Transport.
Together, this PM operationalises BRS4(FM3) as substrate utilisation flexibility.
At the integrated FM level, flexibility does not mean fixed reliance on one fuel. It means maintaining the capacity to process mixed substrates appropriately when demand and metabolic context shift [1][2].
5. Underlying Mechanisms and Requirements
5.1 Cofactors and Substrates
| PM | Cofactors | KC substrates |
|---|---|---|
| BRS4(PM7) | carnitine, riboflavin, niacin, iron | glucose, fatty acids, amino acids (KC1); B vitamins, CoQ10-supportive foods, iron, magnesium (KC2) |
5.2 PMs (Primary Mechanisms)
5.3 KCs (Key Constraints)
5.4 Cross-BRS Links
6. Dietary Levers
Diet
- Carnitine-containing foods ← red meat, dairy, meat-based foods
- Mixed whole-food meals ← broader substrate-flexibility context
- Cofactor-rich foods ← dairy, whole grains, legumes, iron-rich foods
7. Lifestyle Levers
Lifestyle
- Exercise and metabolic conditioning increase the relevance of this FM.
- Stable daily substrate delivery may improve the practical expression of metabolic flexibility.
8. Scoreable Inputs & Modulation Signals
These inputs are used within the BRAIN Diet ontology to generate evidence-constrained estimates of plausible BRS4 support. They are not direct measures of clinical efficacy.
Scoreable Input Categories
| Input Category | Example Inputs | Functional Relevance |
|---|---|---|
| Functional Property Potentials | carnitine_support; mixed_substrate_context; metabolic_flexibility_support | May support substrate utilisation flexibility. |
| Realised Functional States | mixed_whole_food_meal; carnitine_present_pattern | Represent practical fuel-switching support. |
| Substance / Nutrient Signals | carnitine; riboflavin; niacin; iron | Nutrient signals linked to this FM cluster. |
| Preparation Transformations | minimally_processed; whole_food_matrix | May preserve substrate and cofactor quality. |