Test, Don't Guess.
Your tests came back normal. You don't feel normal. There is a gap between what conventional medicine measures and what optimal health actually looks like. We close that gap.
Where do you want to start?
Whether you're ready for the complete clinical investigation or want to start with gut health and resilience — there's a clear path forward.
Test, Don't Guess Programme
Five advanced functional tests run simultaneously. 900+ biomarkers cross-referenced across gut, hormones, metabolism, and immune function. A protocol built entirely from your biology.
The Resilient Gut System™
16-week structured coaching programme. Calm, predictable digestion without restriction. Addresses the gut-stress connection — not just diet.
The same five tests. Different entry points.
Weight loss resistance and adult neurodivergence are two of the most underserved areas in mainstream medicine — and two of the areas where functional testing reveals the most. The TDG system approaches both through the same rigorous five-test methodology. These pages explain how.
Why diets stop working.
Five distinct physiological patterns block fat loss regardless of how carefully you eat. Insulin resistance, HPA axis dysregulation, thyroid insufficiency, gut dysbiosis, and systemic inflammation — each requires a specific intervention. The free 18-question Pattern Finder identifies which is dominant for you.
The diagnosis is not the destination.
Most adults with ADHD, autism or anxiety have been offered medication without anyone investigating the underlying biochemistry. Dopamine and norepinephrine deficits, gut-brain axis disruption, methylation dysfunction, and blood glucose instability are measurable, addressable root causes. We investigate them.
Run simultaneously. Read together.
The power is in the cross-referencing. Each test reveals what the others can't — and patterns across all five reveal what none could identify alone.
Five stages. One clinical investigation.
This is not a consultation followed by a report. It is a structured clinical investigation that reads your biology completely before prescribing anything.
12 intake assessments covering symptoms, history, lifestyle, biometrics, stress, nutrition, movement, psychosocial health, and gut health. Stephen reads every form personally before your first consultation. Nothing automated.
Test kits posted directly to you. Blood draw coordinated through your nearest clinic. All five tests run in parallel — results typically returned within 2–3 weeks.
Results run through the TDG Clinical Platform — 30+ specialist analytical tools cross-referencing all five tests against your intake data. The primary driver is identified. The shortest stave is found.
A structured, periodised clinical programme built entirely from your data. Nutrition matched to your Metabolic Nature. Evidence-based supplementation at the right doses. Lifestyle sequencing. Nothing generic.
Regular check-ins, protocol refinement as you respond, structured re-assessment. The 120-day red blood cell cycle means meaningful change takes time. We track the right markers at the right intervals.
Clinically-directed AI vs generic tools
Every health company now says "AI-powered." The distinction that matters is whether the AI is retrieving information from public data or applying clinical reasoning built from decades of real patient outcomes.
| Capability | Generic AI / ChatGPT | Detective Health Platform |
|---|---|---|
| Reference ranges | Published population standards | Functional practitioner-defined ranges |
| Cross-test pattern recognition | Cannot integrate multiple test types | 50+ tools reading all 5 tests simultaneously |
| Biomarker conflict resolution | May give contradictory advice | Encoded conflict resolution from 37 years of practice |
| Clinical context | Generic, no patient history integration | 12 intake forms read personally before any analysis |
| Protocol sequencing | Not available | Periodised, shortest-stave-first sequencing |
How the TDG approach works
Test, Don't Guess
Why your tests are normal and you still feel terrible.
The complete framework behind every clinical investigation I run. How five functional tests — blood chemistry, GI-MAP stool analysis, DUTCH Plus hormones, organic acids, and food sensitivity — map over 900 biomarkers into a single coherent picture that conventional medicine never assembles.
Written by a practitioner with 37 years of clinical experience. Not theory — method. The same approach applied to every client who walks through the door.
Available worldwide · Amazon paperback · Searchable HTML + PDF digital edition
37 years of clinical experience. Encoded.
Stephen Duncan is a Functional Diagnostic Nutrition Practitioner (FDN-P) with a BSc Hons in Developmental Biology, an MSc in Coaching Studies & Applied Physiology (Heriot-Watt) (Heriot-Watt University), and 37 years of experience in health and fitness — including competitive boxing, athletics coaching from age 18, and over two decades of functional medicine clinical practice in Edinburgh.
Six years of university study included three years of psychology — a thread that runs directly through how the TDG methodology is applied: every client is read as an individual, every protocol is sequenced to meet the person where they are, and the clinical process is as much about understanding human biology as it is about understanding the human.
The platform was built because nothing like it existed. The clinical pattern recognition, functional reference ranges, and conflict resolution logic were built by Stephen over decades of practice. The AI accelerates interpretation and synthesis. It cannot be replicated by asking ChatGPT the same question.
Stephen co-founded Omnos, an early functional lab data platform, and operates Balanced Fitness in Edinburgh alongside Detective Health clinical practice.
Everything you need to know
Stop guessing. Start knowing.
A 30-minute discovery call with Stephen. You explain what's been going on. He explains how the TDG system would approach your specific situation. No obligation — we confirm the fit before anything else.