Detective Health
Stephen Duncan Nutrition
TDG Clinical System
Precision Functional Medicine
A Different Kind of Health Investigation

Test,
Don't Guess.

Five functional tests. Hundreds of data points. One complete picture of what's actually driving your symptoms — and a precise, personalised protocol to address it.

900+ Data Points
200+ Clinical Patterns
5 Functional Tests
37 Years Experience
Prepared by Stephen Duncan FDN-P · MSc
Functional Diagnostic Nutrition Practitioner · Edinburgh
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Most people have been told their results are "normal" — yet they feel anything but. Fatigue that won't shift. Weight that won't move. Symptoms that come and go without explanation. This is what happens when medicine guesses rather than tests.

— The gap between "normal" on a standard blood test and "optimal" for your biology can be enormous. The TDG system finds that gap and closes it.

The Investigation

Five tests that reveal what standard medicine misses

Each test investigates a different system. Together they form a complete biological picture — not a snapshot of symptoms, but a map of root causes across your entire physiology.

01 / BLOOD CHEMISTRY
Advanced Blood Chemistry

150–300 markers with functional reference ranges. Reveals metabolic patterns, inflammation, nutrient status, liver and kidney function — far beyond a standard GP panel.

02 / GI-MAP
Gut Microbiome Analysis

DNA-based stool testing identifying pathogens, dysbiosis, gut immune markers, digestive enzyme status, and intestinal permeability — the gut-systemic connection, quantified.

03 / DUTCH PLUS
Complete Hormone Panel

The most comprehensive hormone test available. Full cortisol curve, sex hormones, oestrogen metabolism pathways, adrenal reserve, melatonin, and neurotransmitter metabolites.

04 / ORGANIC ACIDS
Cellular Energy & Metabolism

Reveals mitochondrial function, Krebs cycle efficiency, neurotransmitter metabolism, methylation markers, and functional B vitamin status at the cellular level.

05 / FOOD SENSITIVITY
IgG4 Food Sensitivity Panel — The Hidden Inflammatory Driver

Delayed food reactions are one of the most commonly overlooked drivers of chronic symptoms — digestive issues, fatigue, skin conditions, joint pain, and brain fog. This panel identifies your specific triggers, allowing for precise, targeted elimination rather than blanket dietary restriction.

What You Receive

A complete clinical programme — not just a report

Every TDG programme includes full clinical interpretation across all five tests, cross-referenced against each other. Your biology doesn't exist in isolation — neither does your analysis.

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Full Test Interpretation
All five tests read by Stephen personally. Functional ranges, not just pathological ones. Cross-test pattern recognition.
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Metabolic Nature Profiling
Your individual nutritional phenotype — one of six Metabolic Natures — determining the food and supplement framework that works for your specific biology.
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Personalised Protocol
Nutrition, supplementation, lifestyle, and movement — sequenced in the right order. Liebig's Law applied: shortest stave first.
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Health Status Report
A comprehensive written summary of findings, patterns, and priorities — yours to keep and refer back to throughout your programme.
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Supplement Protocol
Medicine-tier supplementation where deficiencies are confirmed by testing. Not guesswork — evidence from your own biology.
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Programme Structure
Bompa periodisation applied to health restoration. Phased implementation so the right things happen in the right order — the body adapts, not just reacts.
The Process

From first conversation to lasting change

01
Discovery Consultation
A thorough conversation about your health history, current symptoms, goals, and what you've already tried. Stephen reads your intake forms personally before this call — no starting from zero.
02
Testing
Tests are arranged and coordinated. Blood draw through your nearest clinic or GP. Stool, urine, and saliva tests completed at home over a few days. All kits provided.
03
Clinical Analysis
Stephen analyses all five results using the TDG Clinical Platform — 30+ specialist tools cross-referencing your data against 200+ validated patterns. This takes time. It should.
04
Results & Protocol Delivery
A full results consultation via Zoom. Every finding explained in plain language. Your personalised protocol delivered — not a generic plan, but one built entirely from your test data.
05
Ongoing Support & Re-Assessment
Regular check-ins, protocol refinement as you respond, and structured re-assessment at agreed intervals. The 120-day red blood cell cycle means some changes take time — we track them properly.
Right for You?

This programme is for people who are done guessing

You've had standard blood tests that came back "normal" but you don't feel normal
Fatigue, brain fog, or weight issues that haven't responded to conventional approaches
Hormonal symptoms — PMS, perimenopause, adrenal depletion, thyroid concerns
Digestive issues — bloating, IBS, food reactions, poor absorption
Athletes and high performers wanting to optimise recovery and resilience
Anyone ready to invest seriously in understanding their own biology
Personalisation

Your Metabolic Nature — the nutritional blueprint that's unique to you

One of the most significant findings of the TDG programme is your Metabolic Nature — your individual nutritional phenotype. The same food that fuels one person depletes another. The TDG system identifies which of six Metabolic Natures you are, and builds your nutrition framework around it.

Kinetic
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Grounded
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Catalyst
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Endurance
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Adaptive
Calibrated
Stephen Duncan
FDN-P · MSc
37 Years in Health & Fitness
30+ Clinical Tools Built
5 Functional Test Systems

"I've spent 37 years in health, fitness, and clinical practice — and the last several years building something I couldn't find anywhere else: a complete system for reading the body's data properly.

The TDG Clinical Platform analyses over 900 data points across five tests, identifies patterns that standard medicine misses, and generates a protocol built entirely from your own biology. Not a template. Not a guess.

The clinical logic is ours. The methodology is grounded in Functional Diagnostic Nutrition, metabolic typing, and evidence-based functional medicine. Built with AI, not built on AI."

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The Detective Health Clinical Platform TDG clients access a dedicated clinical portal with 30+ specialist analytical tools — from blood chemistry interpretation to hormonal analysis, gut pattern recognition to metabolic typing. Every test result is run through the platform before your results consultation. You can explore the platform at detective-health.com.
Ready to find out what's actually going on?

Book your discovery consultation

A focused conversation about your health, your goals, and whether the TDG programme is the right fit. No obligation.