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Biological Regulatory Systems

The BRAIN Diet is organised around six Biological Regulatory Systems (BRS): interconnected control systems that link nutrition, lifestyle, physiology, and brain function. While centred on brain health, the framework is designed as a complete dietary approach grounded in core biological systems that support both cognitive function and broader physiological health.

At a practical level, meals are designed as a complementary rotation across the day, aligned with natural rhythms from breakfast through to dinner. Rather than trying to optimise everything in a single meal, each meal plays a role, and each day builds on the next, creating a balanced pattern over time. This reflects how the body actually uses nutrients-absorbing, storing, and reusing them dynamically-so meals are structured to work together, supporting different systems in a coordinated and sustainable way.

Rather than focusing on isolated nutrients, the framework leverages Functional Mechanisms ( key biological controls that can be influenced through diet and lifestyle). Functional Mechanisms represent a grouping of one or more Primary Mechanisms (the underlying biological processes that support those controls) to translate complex biology into practical, usable strategies for improving health.

The Six Biological Regulatory Systems​

Neurotransmitter Regulation​

Signal layer: synaptic communication and behavioural expression.

Methylation & One-Carbon Metabolism​

Biochemical regulation: synthesis, repair, and epigenetic control.

Inflammation & Oxidative Stress​

Immune/redox regulation: inflammatory tone, antioxidant defence, and repair balance.

Mitochondrial Function & Bioenergetics​

Capacity layer: ATP production, mitochondrial resilience, and bioenergetic efficiency.

Gut-Brain Axis & Enteric Nervous System​

Peripheral neural-immune interface: gut signalling, microbial metabolites, and vagal integration.

Metabolic & Neuroendocrine Stress​

Whole-body regulation: stress allocation, autonomic tone, hormonal coordination, and energy prioritisation.