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BRS6-FM2-PM5 — Circadian Feeding & Light–Dark Entrainment​

Stage 2B draft — not approved. Independent Stage 2A/2B preview. Canonical science, mappings, ratings and review status are unchanged.

1. Mission & Overview​

Mission​

Ensure feeding and light exposure stay aligned with circadian rhythms across the 24-hour cycle.

Intervention Dominance: Lifestyle-Dominant — System Optimisation Practices

Inherited qualification requires final scientific approval. Biological requirements alone do not establish responsiveness or comparative dominance. No head-to-head comparative supremacy is established. Other admitted routes remain in section 3; absence of an admission is not inferiority.

Overview​

Daily light and feeding cues help the body keep its internal clocks in step with the outside day. Light primarily informs the central timing system, while meals can shift peripheral metabolic rhythms. Keeping these cues coherent supports coordinated activity, sleep and fuel handling. Human experiments distinguish their effects: delayed meals shifted glucose and adipose-clock timing without shifting cortisol or melatonin, while evening room light suppressed the melatonin signal. Wehrens et al. (2017) [5]; Gooley et al. (2011) [6]

  • Benefits: Coherent cues help coordinate metabolic timing and the biological night. Wehrens et al. (2017) [5]
  • Implementation Notes: Timed meal scheduling and reduced pre-bed room light address different measured timing signals. Wehrens et al. (2017) [5]; Gooley et al. (2011) [6]
  • Biological Relevance: A metabolic improvement during restricted feeding does not itself demonstrate clock entrainment.

2. Primary Biological Effects​

  • Delaying meals shifted glucose and adipose PER2 rhythms in a controlled human protocol. Wehrens et al. (2017) [5]
  • Room light before bedtime suppressed melatonin onset and shortened its duration. Gooley et al. (2011) [6]

3. Intervention Levers​

4. Mechanistic Basis​

Summary​

Delaying meals shifted glucose and adipose PER2 rhythms in a controlled human protocol. Wehrens et al. (2017) [5]

Biological process​

Peripheral entrainment is distinguishable from central melatonin/cortisol timing. Wehrens et al. (2017) [5]

Mechanism Boundary​

A metabolic improvement during restricted feeding does not itself demonstrate clock entrainment. The draft preserves each source’s measured endpoint; the Mission describes the biological job and does not assert that every tested lever achieved the entire Mission.

Integration​

This PM contributes its specified process to BRS6(FM2). Shared fuels, nutrient lists and correlated markers do not merge distinct biological jobs or establish the integrated outcome.

4.1 Scientific Findings​

Summary​

Human meal timing and light experiments support separate cues and compartments. Mouse restricted feeding and obesity associations remain context, not proof that all fasting schedules entrain the human central clock. Wehrens et al. (2017) [5]; Gooley et al. (2011) [6]

5. BRS Pathways and Connections​

5.1 BRS Pathways​

No newly adjudicated BRS pathway is added by this preview.

5.2 Cross-BRS Mechanism Relationships​

No downstream mapping is inherited from a shared nutrient or KC candidate.

5.3 Local BRS Mechanism Relationships​

PM4 addresses cortisol rhythms; peripheral glucose/PER2 timing and central hormone rhythms remain distinct.

7. Phenome Connections​

No new phenome rating is admitted by this unapproved preview. Inherited candidates are retained in the structured assessment history; biomarker or neural changes do not automatically demonstrate a cognitive outcome.

8. References​