here was a time when my work looked very “functional nutrition approved.”
Gut tests.
Generic blood panels.
Dutch tests.
A lot of confident interpretations built on shaky foundations.
And for a while, I genuinely believed that if we just ran more tests, we’d get clearer answers.
But the longer I worked with women dealing with thyroid symptoms like fatigue, hair loss, bloating, constipation, heavy periods, low energy, cold hands and feet, brain fog, and hormonal imbalance, the more obvious something became.
Most conventional functional nutrition testing does not explain what is happening at a thyroid, metabolic, mineral, or tissue level.
It gives fragments, not context.
And when thyroid function is involved, fragments are not enough.
One of the biggest issues with standard functional nutrition testing is the over-reliance on gut tests as a starting point.
Digestive symptoms are automatically assumed to be a gut problem.
But what I repeatedly saw was low stomach acid being labelled as SIBO, slow digestion blamed on microbes rather than low thyroid output, bloating treated as an infection instead of a metabolic signal, and constipation managed with probiotics instead of addressing energy production.
Most gut tests only show what is happening inside the gut lumen. They do not explain why digestion is slow in the first place.
When thyroid hormones are low or poorly converted, stomach acid drops.
When metabolism slows, gut motility slows.
When minerals are dysregulated, bile flow and enzyme production suffer.
No antimicrobial protocol fixes that.
The same problem exists with generic blood testing.
Standard blood panels are often interpreted in isolation.
Low vitamin D is treated as deficiency.
High ferritin is labelled iron overload.
Low ferritin is assumed to be iron deficiency.
A normal TSH is taken as proof the thyroid is healthy.
But biology does not work in straight lines.
Storage vitamin D and active vitamin D are not the same thing.
Low levels can indicate poor conversion.
High levels can indicate poor utilisation.
Both can signal dysregulation, not deficiency or excess.
The same applies to iron markers, calcium, magnesium, sodium, potassium, and even thyroid hormones themselves.
Without context, blood results can be deeply misleading.
Dutch testing presents another issue, particularly when it comes to estrogen.
While often marketed as comprehensive hormone testing, it does not reliably reflect tissue-level estrogen activity.
Many women show “normal” estrogen results while experiencing clear estrogen-dominant symptoms that suppress thyroid function, including heavy periods, breast tenderness, fluid retention, migraines, and fatigue.
Urinary metabolites do not always reflect what is happening inside cells.
And thyroid symptoms are driven by what is happening inside cells.
That realisation is what led me to completely change my clinical model and focus on advanced thyroid lab tests in London that actually reflect metabolic function.
Everything changed when I stopped treating the thyroid as a single gland and started viewing it as a metabolic coordinator.
The thyroid regulates stomach acid production, gut motility, bile flow, blood sugar balance, hair growth, body temperature, menstrual flow, estrogen clearance, brain function, and inflammatory load.
When thyroid function is suppressed, symptoms appear across multiple systems at once.
Instead of chasing symptoms, I rebuilt my testing approach around thyroid physiology, mineral balance, and stress adaptation.
My work now begins with a full thyroid lab panel, not just TSH.
This includes TSH, free T4, free T3, reverse T3, thyroid antibodies, and thyroid binding markers.
Low energy is rarely just “low thyroid.”
More often it is poor T4 to T3 conversion, elevated reverse T3 due to stress, inflammation interfering with receptor sensitivity, or mineral imbalances blocking thyroid hormone action.
Alongside thyroid labs, I run a comprehensive blood panel focused on mineral-based markers, rather than isolated reference ranges. Using the insights and analysis style of Dr Ray Peat.
Using the mineral framework developed by Morley Robbins, I assess blood patterns that reveal iron dysregulation, inflammatory signalling, copper bioavailability, magnesium status, sodium and potassium balance, oxidative stress, and adrenal load.
Iron dysregulation is one of the most overlooked drivers of thyroid suppression, fatigue, anxiety, and hormonal imbalance.
Ferritin alone does not tell that story.
To complete the picture, I use hair tissue mineral analysis as a metabolic stress test.
Not as a diagnostic tool in isolation, but as a way to assess long-term mineral patterns, stress adaptation, burnout physiology, hidden deficiencies masked in blood work, thyroid suppression signatures, estrogen dominance trends, and nervous system tone.
Blood shows what is happening now.
Hair shows what has been happening over months.
Together, they reveal patterns that standard thyroid lab tests alone cannot capture.
This is why women seeking thyroid lab tests in London often arrive with symptoms they have been told are “normal.”
Low stomach acid.
Bloating after meals.
Constipation.
Hair thinning.
Cold extremities.
Crushing fatigue.
Brain fog.
Anxiety.
Heavy or irregular periods.
Debilitating PMS.
And are told everything looks fine.
It is not fine.
It is adaptive dysfunction.
The body is slowing metabolism to survive stress, inflammation, mineral depletion, blood sugar instability, and hormonal overload.
Unless you measure thyroid function properly and interpret it within a mineral and metabolic framework, these patterns remain invisible.
I did not stop offering conventional functional nutrition because it was useless.
I stopped because it was incomplete.
True thyroid recovery does not come from surface-level testing.
It comes from understanding how thyroid hormones interact with minerals, stress physiology, liver function, digestion, and energy production at a systems level.
When you stop guessing and start running the right thyroid lab tests, the symptoms finally make sense.
And more importantly, they finally change.
Download my free guide to assess your metabolic health using body temperature and pulse.
I am building a course for those who want to take a guided approach with community support.
You can book a call to chat with me about 1:1 coaching for women wanting expert support to transform their thyroid, energy, and hormonal health.
Warmly,
Joel
