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Research Resources Results Primitive reflexes
Protocol References

pmchs.org · Participatory research

Wellness Protocol
without medication

An 8-week programme to support your immune and nervous system, adapted for hypersensitive profiles.

MCAS / SHMP TDAH SED Lipœdème Fibromyalgie Long Covid

This protocol does not replace medical follow-up. It compiles evidence-based lifestyle strategies to reduce mast cell activation, calm the autonomic nervous system, and improve daily quality of life — without medication, without risk.

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Low-histamine nutrition

Reducing the daily histamine load

Why? In PMCHS/MCAS profiles, mast cells release excess histamine. Reducing dietary histamine and histamine-liberating foods lowers the total load and alleviates symptoms.
  • Favour: fresh foods cooked the same day, cooked vegetables (courgette, green beans, sweet potato, broccoli), fresh meats (no deli meats), rice, quinoa, apples, pears, grapes, fresh herbs (basil, chives).
  • Avoid: fermented foods (aged cheeses, yoghurt, sauerkraut, vinegar), alcohol, tomatoes, spinach, aubergine, nuts, canned fish, reheated leftovers.
  • Storage tip: freeze meat and fish immediately after purchase. Cold prevents bacterial histamine formation.
  • Keep a food diary for 2 weeks to identify personal triggers. Everyone has their own threshold.
  • Cook with olive oil, fresh herbs, lemon (moderate) to maintain a flavourful diet without triggers.
Start by eliminating the 3 main triggers (aged cheese, alcohol, canned goods) for 2 weeks before making further adjustments. A gradual approach is more sustainable.
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Gentle & adapted movement

Activate without triggering

Why? Intense exercise can trigger mast cell degranulation. Gentle movement, however, improves lymphatic drainage (crucial for lipedema), reduces chronic inflammation and stabilises the autonomic nervous system.
  • Light walking: 15 to 30 min/day at conversational pace. Why: improves lymphatic drainage, reduces cortisol and stabilises blood sugar without triggering mast cell degranulation. The only aerobic exercise safe at all stages of the PMCHS terrain.
  • Gentle or yin yoga: 20 min, 3×/week. Why: held positions activate the parasympathetic system via joint baroreceptors — directly reducing mast cell activation. Particularly beneficial for EDS (proprioception). Free YouTube channels: Yoga with Adriene, Tara Stiles.
  • Aqua gym or gentle swimming: Why: hydrostatic pressure promotes venous and lymphatic return (crucial for lipedema). Water supports body weight and reduces load on hypermobile joints. Gentle water thermoregulation soothes the autonomic nervous system.
  • Rebounding (mini-trampoline): 5 to 10 min/day. Why: rebounding stimulates lymphatic drainage via rhythmic muscle contractions without joint impact. Also increases vagal tone through vestibular stimulation — doubly beneficial on a PMCHS terrain.
  • Golden rule: stop before fatigue, not after. Why: muscular exhaustion releases pro-inflammatory cytokines (IL-6, TNF-α) that can trigger reactive degranulation. In case of post-exertion malaise, halve the intensity.
Prefer morning or early afternoon for activity. Avoid exercise within 2 hours of bedtime to avoid disrupting sleep.
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Nervous system regulation

Vagus nerve · Breathing · Cardiac coherence

Pourquoi ? The autonomic nervous system directly regulates mast cells via the vagus nerve. In"threat" mode (sympathetic), mast cells activate more. Activating the vagus nerve switches to"rest-repair" mode and reduces inflammation.
  • Cardiac coherence 3-6-5: 3 times/day, 6 breaths/minute, 5 minutes. Free app: RespiRelax. Why: synchronises heart rate with breathing, increasing heart rate variability (HRV) — a direct marker of vagal tone. High vagal tone inhibits CRH release and reduces mast cell activation. Best practised before meals.
  • 4-7-8 breathing: inhale 4 sec, hold 7 sec, exhale 8 sec. 4 cycles. Why: prolonged retention raises blood CO₂, directly activating the vagus nerve and triggering parasympathetic vasodilation — short-circuiting the adrenaline → degranulation cascade. Powerful during mild histamine reactions.
  • Vagus nerve stimulation: cold water gargles (30 sec), humming, singing, laughing. Why: these actions activate the auricular and pharyngeal branches of the vagus nerve via the pharynx and larynx muscles — direct access points to the parasympathetic system without medication. Cold also activates vagal pathways via cervical thermoreceptors.
  • Warm bath or shower (36-37°C, not hot): Why: intense hot water (>39°C) triggers systemic vasodilation and releases histamine from cutaneous mast cells. Warm temperature instead stimulates mild cold receptors, activating the parasympathetic system and reducing inflammation.
  • Nature contact (earthing): walk barefoot 15 min/day if possible. Why: direct earth contact enables free electron transfer that neutralises pro-inflammatory free radicals — documented antioxidant effect with measurable reduction in cortisol and inflammatory markers.
Cardiac coherence has a cumulative effect: benefits build week by week. Top priority if you can only choose one tool.
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Sleep hygiene

Repair & reset every night

Why? Histamine is also a wakefulness neurotransmitter. With a high histamine load, sleep becomes fragmented. Conversely, poor sleep increases intestinal permeability and mast cell activation the following day.
  • Regular bedtime: same time every day, including weekends. Why: the circadian rhythm programmes mast cell activity — their density and activation threshold vary by hour. Irregular sleep-wake cycles disrupt the immune clock and increase nocturnal inflammatory reactivity.
  • Cool and dark room: 18-19°C, total darkness. Why: melatonin — inhibited by blue light and heat — is also a mast cell stabiliser. A melatonin deficit increases nocturnal intestinal permeability and amplifies histamine peaks at 2-4am.
  • Screens off 1h before bed: Why: screen blue light suppresses melatonin and keeps the sympathetic system activated — incompatible with nocturnal mast cell regulation. Replace with reading, gentle stretching, journalling.
  • Light, low-histamine dinner: at least 2h before bedtime. Why: nocturnal digestion of fermented foods generates an intestinal histamine peak absorbed around midnight — responsible for 2-4am wake-ups with hot flushes, itching or palpitations. Avoid: alcohol, cheese, tomatoes, reheated leftovers in the evening.
  • Evening herbal tea: chamomile, lemon balm, linden. Why: chamomile contains apigenin (a mast cell-stabilising flavonoid), lemon balm inhibits GABA breakdown, and linden activates GABA-A receptors — triple calming action with no risk. Avoid valerian if ADHD (may have the reverse effect).
If you consistently wake between 2am and 4am with hot flushes, itching or racing heart — this is often a nocturnal histamine peak. An H1 antihistamine taken at dinner (to validate with your doctor) may help.
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Natural dietary supplements

Mast cell stabilisers · Neuroprotection · Anti-inflammatory

Why? Certain natural compounds have documented mast cell-stabilising and neuroprotective activity in vitro and clinically. They do not replace medical treatment but can reduce overall inflammatory load and support myelination. Always inform your doctor.

Level 2a — Mast cell stabilisation

  • Quercétine : 500 mg, 2×/day with meals. Mast cell stabiliser, degranulation inhibitor, intestinal GLP-1 stimulant. Choose phytosomal form or with bromelain for better absorption.
  • Lutéoline : 100–400 mg/day. Potent inhibitor of mast cell cytokine release. Often combined with quercetin.
  • Lysine : 500–1000 mg/day. Mast cell stabiliser, L-carnitine precursor, supports oligodendrocytes (myelin-producing cells).
  • NAC (N-acétylcystéine) : 600 mg/day. Glutathione precursor, potent antioxidant. Reduces oxidative stress associated with mast cell activation and protects myelin.
  • Magnésium (glycinate ou malate) : 300–400 mg in the evening. Reduces neural hyperreactivity, improves sleep, particularly useful with associated ADHD.

Level 2b — Neuroprotection & remyelination

  • Oméga-3 DHA/EPA : 2–3 g/day with a fatty meal. Direct structural component of myelin membranes, anti-inflammatory via leukotrienes, GLP-1 stimulant. Prefer triglyceride form, wild fish oil or algae. Increased dose for documented neuroprotective effect.
  • L-Carnitine : 500–1000 mg/day in the morning. Transports fatty acids into oligodendrocyte mitochondria for the energy production necessary for myelination. Particularly relevant on PMCHS terrain with compromised mitochondria.
  • Vitamine E (tocophérol) : 200–400 IU/day. Neurological antioxidant, protects myelin membranes from chronic oxidative stress.
  • Vitamine B12 (méthylcobalamine) : 1000 µg/day. Myelin protection — a deficit progressively demyelinates. Prefer methylcobalamin form, better absorbed than cyanocobalamin.
  • Vitamine D3 + K2 : D3 2000–4000 IU/day with K2 (MK-7) 100–200 µg/day, with a fatty meal. Why together: D3 promotes calcium absorption and immunomodulation; K2 directs calcium to bones rather than arteries — an essential combination on PMCHS terrain where vascular calcification risk is increased. D3 deficiency is near-universal in these profiles.
Introduce one supplement at a time, every 1–2 weeks. This allows you to identify reactions and attribute improvements. Start with level 2a before introducing 2b. Some supplements (notably quercetin) show noticeable effect after 3–4 weeks only.
💡 "Die-off" effect (detoxification reaction)
When introducing mast cell stabilisers or microbiome-modulating supplements, a temporary worsening of symptoms (fatigue, headaches, brain fog, skin irritation) is possible for a few days. This phenomenon, related to a Jarisch-Herxheimer-type reaction, reflects an increased release of mediators during the rebalancing of the terrain rather than an intolerance. It is generally transient (3 to 10 days); if symptoms are marked or prolonged, reduce the dose and increase it gradually, and discuss it with your doctor.
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Medications known for their effect on the PMCHS terrain

Information only · Not medical advice · To be evaluated with your doctor

⚠️ Important note: This section is not medical advice and does not replace a medical consultation. It lists medications documented in the scientific literature for their effect on mast cell mechanisms. None of these medications should be taken without a prescription and medical supervision. This list is provided to facilitate discussion with your doctor.

Antihistamines

  • Antihistaminiques H1 (cetirizine, loratadine, fexofenadine…): block H1 receptors, reducing histamine-mediated symptoms — urticaria, pruritus, rhinitis, brain fog. The choice of molecule and timing (morning vs evening) can make a significant difference depending on your dominant phenotype.
  • Antihistaminiques H2 (famotidine, ranitidine…): block gastrointestinal H2 receptors. Documented to reduce digestive symptoms and potentiate H1 effect. Often prescribed alongside H1 blockers in MCAS.

Mast cell stabilisers and modifiers

  • Cromoglycate de sodium (oral Nalcrom): direct mast cell stabiliser, inhibits degranulation. Documented in oral MCAS, particularly for gastrointestinal symptoms. Local intestinal action, low systemic absorption.
  • Montélukast (Singulair): leukotriene receptor inhibitor. Particularly relevant for the leukotriene-dominant phenotype (respiratory symptoms, chemical sensitivity, cognitive fatigue). Also documented for bronchial hyperreactivity and some ADHD profiles.
  • Aspirine faible dose (under strict medical supervision): inhibits prostaglandin synthesis via COX-1/COX-2. Relevant for the prostaglandin phenotype (dysmenorrhoea, proctalgia, hypersomnia). Contraindicated in NSAID intolerance or haemorrhagic tendency.

Autonomic nervous system modulators

  • Guanfacine (Intuniv, Tenex): α2A adrenergic agonist, reduces prefrontal noradrenaline. Documented for ADHD, hypervigilance and chronic anxiety — particularly relevant on PMCHS terrain as it reduces locus coeruleus activation and noradrenergic mast cell hyperreactivity.
  • Agonistes GLP-1 — microdosés (semaglutide/Ozempic, liraglutide… at sub-therapeutic doses, off-label): at very low doses, distinct from those used for diabetes or obesity, documented for anti-inflammatory effect via NF-κB inhibition, reduction of mast cell activation and improvement of vagal tone. Exploratory use on PMCHS terrain — to be discussed with your doctor, microdosing protocol to be defined together.
  • Naltrexone faible dose (LDN) : 1.5–4.5 mg/day (off-label). Immunomodulator via immune cell opioid receptors. Documented in fibromyalgia, ME/CFS and certain chronic mast cell activation profiles. Requires a prescription and follow-up.
This list reflects the available scientific literature on PMCHS mechanisms. It is provided to enable an informed discussion with your doctor, not for self-medication. Each molecule has its own indications, contraindications and interactions.
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Medications that may aggravate the PMCHS terrain

Discuss with your doctor before stopping or changing any treatment

ClassExamplesMechanismRisk
OpioidsMorphine, codeine, pethidineDirect non-IgE mast cell degranulationHigh
NSAIDsIbuprofen, aspirin, ketorolacCOX-1 inhibition → shift toward the leukotriene pathwayVariable
IV vancomycinIntravenous form only"Red Man Syndrome" — direct histamine releaseHigh
FluoroquinolonesCiprofloxacin, levofloxacinInterference with histamine breakdown (DAO)Moderate
Beta-lactamsAmoxicillin and derivativesDocumented non-allergic hypersensitivity on mast cell terrainModerate
ACE inhibitorsLisinopril, enalaprilIncreased bradykinin → mast cell activationModerate
Beta-blockersPropranolol, metoprololLowers the mast cell activation threshold, hinders epinephrine action in emergenciesModerate
Neuromuscular blockersAtracurium, succinylcholineHistamine release during general anaesthesiaHigh
Ester local anaestheticsBenzocaine, procaine, tetracaineDocumented triggers; lidocaine (amide) is generally well toleratedModerate
Iodinated contrast mediaInjected imaging contrastNon-IgE mast cell activation upon injectionModerate
PPIsOmeprazole, lansoprazolePossible interference with histamine breakdown (DAO)Variable
Muscle relaxantsSome central muscle relaxantsExcipients and some molecules reported as triggersVariable
Alcohol (excipients)Oral solutions, syrupsDegranulation cofactor in many PMCHS profilesModerate

This list is not exhaustive and sensitivity varies greatly between individuals. Never stop an ongoing treatment without medical advice.

📄 Download the full, sourced list
Important note: This protocol is provided for informational and educational purposes only. It does not constitute medical advice and does not replace consultation with a healthcare professional. In case of doubt, severe symptoms or possible drug interactions, consult your doctor before making changes. The dietary supplements mentioned are general suggestions; their use must be adapted to your personal situation.