The Presentation
A client came to me with persistent skin issues — painful, broken skin that wasn't responding to treatment. The GP route had been the standard one: topical creams prescribed, symptoms assessed at the surface level. When topical treatment failed, the next referral was dermatology. Another specialist looking at the same symptom from the same angle.
The client also described what they felt was IBS — unpredictable digestion, bloating, discomfort. The kind of symptoms that earn you a diagnosis-by-exclusion and a recommendation to "manage stress and eat more fibre."
But the GP blood results were already telling a bigger story. Markers suggesting pre-diabetes and possible fatty liver — sub-clinical patterns that in conventional medicine get a "we'll keep an eye on that" but rarely get investigated further at this stage.
From a functional medicine perspective, I wasn't looking at four separate problems. I was looking at one interconnected pattern.
What the Stool Test Showed
The GI-MAP results made the connection visible.
So now the picture makes sense. Below-detectable akkermansia means compromised gut barrier integrity — and akkermansia is directly implicated in blood sugar regulation and metabolic health. The candida and streptococcus overgrowth are driving inflammation. The parasites are adding immune load. And the skin? The skin is the body's overflow detoxification pathway. When the gut is inflamed, the liver is congested, and the immune system is busy elsewhere, the skin takes the hit.
The dermatologist would have seen skin. The stool test showed dysbiosis, parasites, and a metabolic pattern that connected every symptom to one root-cause picture.
The Clinical Logic
This is where functional medicine diverges from the conventional approach. A GP sees skin, prescribes topical. When that fails, refers to dermatology. Separately, blood sugar is "borderline" — monitor and revisit. Separately, IBS — manage symptoms. Three clinicians, three separate problem domains, no integration.
From the stool test alone, I can draw a line through all four symptoms:
Dysbiosis and parasites → gut inflammation → impaired barrier integrity → immune activation → skin symptoms. The same dysbiosis pattern — specifically the absent akkermansia and candida overgrowth — has well-documented associations with insulin resistance and hepatic fat accumulation. The "pre-diabetes" and "fatty liver" markers on the GP blood results aren't separate findings. They're the metabolic expression of the same gut dysfunction.
This is a pattern I see regularly in clinical practice. The client who presents with skin issues almost always has a gut story underneath. The client with borderline metabolic markers almost always has a microbiome story underneath. When you test comprehensively, the connections become obvious. When you don't test, each symptom looks like a separate problem requiring a separate specialist.
What Happens Next
The client now has something they didn't have before: a clear, specific, evidence-informed plan based on their actual biology — not generic dietary advice.
The dietary changes are targeted and manageable: moderate sugar and dairy intake, minimise those foods particularly on days when alcohol is consumed (which for this client is one day a week, two glasses of wine — modest by any standard). Remove gherkins, which despite being a food the client enjoys, are a fermented food that feeds the organisms we're trying to reduce. No new fermented foods for now — counterintuitive for many people, but adding fermented foods into a dysbiotic gut amplifies the problem, not the solution.
Instead, we're adding cold potatoes, cold rice, and green-tipped bananas — resistant starch sources that selectively feed beneficial species including the akkermansia we need to rebuild. More cruciferous vegetables and berries for their prebiotic fibre and polyphenol content. More protein, fewer refined carbohydrates.
On the supplement front, we're starting conservatively: magnesium glycinate for its role in blood sugar regulation, sleep quality, and gut motility, and berberine for its well-documented effects on both blood sugar management and antimicrobial activity against candida and parasites. A three-to-six-month commitment on both. If I get the buy-in, we get more precise on the supplement protocol — but the principle is always the same: start with what the client can manage, build from there.
Why This Matters
This client's skin problem wasn't a skin problem. Their IBS wasn't "just IBS." Their borderline blood sugar wasn't a separate metabolic issue. It was one pattern expressing through four symptoms across four apparent problem domains — and it took one stool test to make that visible.
The conventional route — topical cream, then dermatology, then maybe endocrinology, then gastroenterology — would have involved multiple specialists over many months, none of whom would have seen the others' findings, and none of whom would have run a comprehensive stool test to look at the picture from the gut up.
I'm not criticising the GP. The referral pathway is what the system allows. But the system doesn't allow for the kind of cross-system investigation that functional testing provides. And for clients with multi-system presentations — which is most of the clients I see — that cross-system view is where the answers live.
This is what "test, don't guess" means in practice. Not a philosophy. Not a slogan. A clinical method that produces different outcomes because it asks different questions.
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