Fibromyalgia · PMOS · IBS · Depression · Anxiety · OCD · Cluster 2 · Research Poster

The Shared Biology
Behind These Conditions

These conditions do not travel together by coincidence. They share the same upstream drivers — a dysregulated gut-brain axis, chronic HPA stress activation, central sensitisation and systemic low-grade inflammation. Evidence-graded. May 2026.

Oh Darling, It's Biology.
@ohdarlingitsbiology
Three Upstream Drivers
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Gut Dysbiosis
Disrupted gut microbiome reduces SCFA production, weakens the gut barrier and triggers systemic LPS-driven inflammation that reaches every organ simultaneously.
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HPA Dysregulation
Chronic stress keeps cortisol elevated, driving insulin resistance, androgen excess, neuroinflammation and suppressing serotonin production — all at the same time.
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Central Sensitisation
The nervous system becomes amplified — pain signals, emotional signals and sensory signals are turned up body-wide. Every condition in this cluster is linked to this mechanism.
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Insulin Resistance
Elevated cortisol and gut LPS trigger insulin resistance → compensatory hyperinsulinaemia → androgen overproduction → the PMOS phenotype and worsening systemic inflammation.
The Gut-Brain Axis — One System, Six Expressions
How One System Drives All Six Conditions
Gut Dysbiosis → ↑ LPS Endotoxin → TLR4 Activation → Systemic Inflammation → All Conditions Worsen
Depression / Anxiety / OCD
Reduced serotonin and GABA synthesis; elevated neuroinflammatory cytokines impair mood regulation directly
Fibromyalgia
Pro-inflammatory species amplify central sensitisation; reduced butyrate impairs pain gating
IBS
Dysbiosis directly causes visceral hypersensitivity and dysmotility — co-occurs in 50–70% of fibromyalgia
PMOS
LPS activates TLR4 → insulin resistance → hyperinsulinaemia → androgen excess and hormonal dysregulation
The Key Mechanisms — With Citations
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Central Sensitisation Fibromyalgia & IBS
Neuroinflammatory cytokines lower the pain threshold body-wide. Confirmed in 85.8% of chronic plantar fasciitis patients, fibromyalgia and IBS. The nervous system amplifies all signals — pain, emotion, sensation — simultaneously. This is not psychosomatic; it is a measurable physiological state.
Multiple central sensitisation systematic reviews 2022–2025, PMC/PubMed
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Insulin Resistance & Androgen Excess PMOS Driver
Elevated cortisol and gut LPS trigger insulin resistance, causing compensatory hyperinsulinaemia that drives androgen overproduction. This creates the PMOS phenotype. PMOS was formally renamed from PCOS in May 2026 (Teede et al., The Lancet) to reflect its metabolic and neuroendocrine nature, not just ovarian cysts.
Teede et al., 2026, The Lancet, doi: 10.1016/S0140-6736(26)00717-8
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HPA Axis & Serotonin Deficit Depression & OCD
Chronic stress and gut dysbiosis reduce serotonin synthesis and deplete dopamine precursors. Sustained high cortisol shrinks the hippocampus and reduces serotonin receptor density — directly driving depression, anxiety and OCD compulsive loops. This is a structural change, not a character trait.
Multiple HPA/depression reviews, PMC/PubMed 2022–2025
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Gut Barrier Dysfunction Root of All Six
Reduced microbial diversity impairs intestinal barrier integrity. Bacterial LPS enters circulation, activating TLR4 inflammatory pathways that reach the brain, ovaries, fascial tissue and pain processing centres simultaneously. This is why these six conditions share a biological root.
NIH/PMC Gut-Brain Reviews 2023–2025 · Frontiers in Endocrinology 2024
Evidence-Based Supplement Protocol
1
Magnesium Glycinate
DepressionAnxietyFibromyalgiaOCD
Cofactor for serotonin and GABA synthesis. Deficiency near-universal in depression, anxiety and fibromyalgia. Reduces cortisol reactivity and relaxes central sensitisation. Glycinate is best for sleep and anxiety.
300–400mg · Evening
2
Myo-Inositol + D-Chiro (40:1)
PMOSOCDAnxiety
The single most evidence-backed supplement for PMOS. Improves insulin sensitivity, restores ovarian function, reduces androgens. Also reduces OCD severity in RCTs via serotonin receptor signalling. Allow 3–6 months for full hormonal benefit.
2–4g daily · Split doses
3
Vitamin D3 + K2
DepressionFibromyalgiaPMOS
Deficiency confirmed in depression, fibromyalgia and PMOS. D3 supports serotonin synthesis genes, reduces central sensitisation via VDR receptors and improves insulin sensitivity in PMOS.
2000–4000 IU · Fatty meal
4
Omega-3 High EPA
DepressionFibromyalgiaIBSPMOS
Meta-analyses confirm EPA reduces depression severity. Resolves neuroinflammation, restores gut barrier integrity, modulates central sensitisation and reduces the inflammatory cytokines driving fibromyalgia pain.
2–3g EPA/day · With meal
5
Multi-Strain Probiotic
IBSOCDDepressionPMOS
Directly targets the root cause — gut dysbiosis. Restores SCFA production, repairs gut barrier, reduces LPS leakage and systemic inflammation. L. rhamnosus reduces OCD-like behaviours in RCTs. L. acidophilus reduces IBS severity.
10–50B CFU · Morning fasted
6
NAC 600mg
OCDFibromyalgiaDepression
Glutathione precursor and glutamate modulator. RCTs show NAC reduces OCD severity by normalising glutamate levels in the striatum. Also reduces oxidative stress in fibromyalgia and supports gut barrier repair.
600–1200mg · With food
7
Methylated B-Complex
DepressionOCDPMOS
MTHFR variants impair neurotransmitter synthesis. 5-MTHF is the most well-evidenced adjunct to antidepressants. Also reduces homocysteine — elevated in both PMOS and depression. Always use methylated form only.
400–800mcg 5-MTHF · Morning
⚠ Start at ¼ dose — some people react to methyl donors.
8
Berberine 500mg
PMOSIBSFibromyalgia
Activates AMPK — the same pathway as metformin — to reduce insulin resistance, lower androgens and restore menstrual regularity in PMOS. Also modulates gut microbiome composition directly.
500mg x2/day · Before meals
⚠ GP check required — significant drug interactions with statins, diabetes medication and antibiotics.
9
Ashwagandha KSM-66
AnxietyPMOSFibromyalgia
KSM-66 RCTs confirm significant reduction in cortisol, anxiety scores and perceived stress. Targets HPA axis hyperactivation — the driver behind insulin resistance, androgen excess and central sensitisation in this cluster.
300–600mg · Evening
10
Zinc + Selenium + Biotin
PMOSDepressionFibromyalgia
Zinc inhibits 5-alpha reductase — the enzyme converting testosterone to DHT, the primary androgen driver in PMOS. Selenium essential for thyroid function. Both commonly depleted in PMOS and depression.
15–30mg Zinc · With food
Phased Implementation
1
Weeks 1–4 · Foundation
Magnesium Glycinate + Vitamin D3/K2 + Omega-3. Address the most universal deficiencies. Establish tolerability.
2
Weeks 4–8 · Gut & Hormones
Add Probiotic + Myo-Inositol. Directly target gut dysbiosis and the PMOS insulin-androgen cycle. Allow 6–8 weeks for full effect.
3
Weeks 8–12 · Brain & Pain
Add NAC + Ashwagandha. Target OCD glutamate loop, central sensitisation and HPA cortisol dysregulation.
4
Week 12+ · Fine-Tuning
Add Methylated B-Complex + Berberine + Zinc/Selenium. Methylation, insulin sensitisation and androgen control. GP check required before Berberine.
Lifestyle Foundations
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Low-Glycaemic, Anti-Inflammatory Diet
Reduces insulin spikes (PMOS), feeds beneficial gut bacteria (IBS/mood), and reduces central sensitisation. Prioritise fibre, omega-3s, polyphenols.
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Gentle Daily Movement
Even 20 minutes walking improves insulin sensitivity, reduces cortisol, increases BDNF and reduces fibromyalgia pain scores. Start where you are.
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Nervous System Regulation
Trauma-informed therapy directly addresses HPA dysregulation. Diaphragmatic breathing activates the vagus nerve and shifts the nervous system from sympathetic to parasympathetic.
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Sleep Prioritisation
Poor sleep increases cortisol, worsens insulin resistance, reduces fibromyalgia pain threshold and impairs gut barrier repair. Magnesium glycinate at night supports this directly.
⚠ Important — Please Read
This poster is for educational purposes only and does not constitute medical advice. It is not a substitute for professional medical consultation, diagnosis or treatment. Always consult your GP or a qualified healthcare professional before making any changes to your supplement or medication regimen — particularly Berberine (significant drug interactions with statins, diabetes and antibiotic medication) and Methylated B-Complex (if on antidepressants). Myo-Inositol should be discussed with your GP if you are managing blood glucose. Individual health circumstances vary significantly. If symptoms concern you, please seek medical advice promptly.
Oh Darling, It's Biology · @ohdarlingitsbiology · ohdarlingitsbiology.com
Research Sources
Teede et al., 2026, The Lancet — PMOS rename (doi: 10.1016/S0140-6736(26)00717-8) · NIH/PMC Gut-Brain Reviews 2023–2025 · Frontiers in Endocrinology, 2024 — PMOS and HPA · Adams et al., 2025, Autonomic Neuroscience — PMOS autonomic dysfunction · Yu et al., 2024, Front. Endocrinol. — PMOS sympathetic nervous system · PMC/PubMed central sensitisation reviews 2022–2025 · Multiple PMOS/IBS/fibromyalgia supplement RCTs, PMC 2022–2025 · Oh Darling, It's Biology · May 2026