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Hormones & Genes

Genotype is not destiny; dose still rules endocrine headlines.

Genes and hormones attract absolute claims. This section covers MTHFR variants with ACMG-aligned utility (and folic acid's Grade A NTD prevention role), hereditary hemochromatosis and penetrance, and the rigorous dose bridge showing that ecological estrogen signals in fish are not municipal tap-water contraceptive doses for men. Inflammation and allergy axes sit adjacent where immune pathways intersect lifestyle.

  1. Hormones & Genes

    Non-IgE Hypersensitivity Pathways: FPIES, EoE, Contact & Cell-Mediated Allergy

    Delayed food reactions, eosinophilic disease, and Type IV contact pathways—when IgE tests stay negative and the clock matters more than the panel.

    ELENA VOSS 4 MIN READ

  2. Hormones & Genes

    Mast Cell & Basophil Effector Biology: Mediators, Triggers & Tryptase Kinetics

    Tissue mast cells and circulating basophils release histamine, tryptase, lipids, and cytokines—IgE and non-IgE triggers, with tryptase as the practical activation clock.

    JULIAN HART 4 MIN READ

  3. Hormones & Genes

    Mast Cell Activation Syndrome: Consensus Criteria, Tryptase Rule & Overdiagnosis Risk

    Vienna/AAAAI-aligned MCAS needs clinical episodes, laboratory mediator proof, and treatment response—not a symptom checklist.

    JULIAN HART 4 MIN READ

  4. Hormones & Genes

    Fragrance Phthalates: DEP, MEP, and What Perfume Really Adds

    DEP is the fragrance solvent most people actually carry. MEP tracks perfume use within hours—not DEHP plasticizer myths.

    ELENA VOSS 4 MIN READ

  5. Hormones & Genes

    Fragrance Chemicals and Hormone Receptors: Mechanisms Without Myth

    In vitro ER/AR signals, anti-androgenic phthalates, and musk receptor findings—graded carefully against human dose.

    JULIAN HART 4 MIN READ

  6. Hormones & Genes

    Fluoride, Thyroid, and Kidney: What Evidence Actually Shows

    High fluoride and iodine deficiency can interact on thyroid; kidneys both excrete fluoride and suffer in advanced disease. Grade claims carefully.

    ELENA VOSS 4 MIN READ

  7. Hormones & Genes

    Allergy & Inflammation Testing: sIgE, SPT, OFC, FeNO, Eos & What Not to Order

    History-first diagnostics for IgE disease versus T2 markers versus systemic CRP—stop using the wrong panel for the wrong question.

    ELENA VOSS 4 MIN READ

  8. Hormones & Genes

    Hemochromatosis Liver Damage: Fibrosis, Cirrhosis, and HCC

    Ferritin >1000 flags fibrosis risk. Pre-cirrhotic phlebotomy is the outcome hinge.

    JULIAN HART 4 MIN READ

  9. Hormones & Genes

    Hemochromatosis Organ Damage: Heart, Joints, and Pituitary

    MCP arthropathy, cardiomyopathy, hypogonadism—some improve with phlebotomy, some do not.

    JULIAN HART 4 MIN READ

  10. Hormones & Genes

    Riboflavin, MTHFR C677T, and Blood Pressure: The Targeted Trial Signal

    1.6 mg riboflavin helped 677TT hypertensives in trials—not a cure for “MTHFR disease.”

    MARCUS CHEN 4 MIN READ

  11. Hormones & Genes

    PFAS, Thyroid, Immune Response, and Cholesterol: Non-Cancer Endpoints

    Beyond cancer headlines, PFAS evidence concentrates on lipids, vaccine antibody responses, and thyroid disease—the endpoints that shaped EFSA’s TWI and NASEM clinical tiers.

    ELENA VOSS 5 MIN READ

  12. Hormones & Genes

    Homocysteine, MTHFR, and When the Lab Phenotype Matters

    Homocysteine is the actionable phenotype more often than a C677T sticker.

    MARCUS CHEN 4 MIN READ

  13. Hormones & Genes

    HFE C282Y Penetrance: Why Genotype Is Not Destiny

    C282Y homozygosity raises risk; most homozygotes never get full clinical hemochromatosis.

    MARCUS CHEN 4 MIN READ

  14. Hormones & Genes

    Fragrance Trade Secrets: Why “Fragrance” Hides Dozens of Chemicals

    U.S. labels may legally collapse complex mixtures into one word. EU allergen rules and MoCRA are closing gaps—slowly—while most adults still misunderstand disclosure.

    ELENA VOSS 6 MIN READ

  15. Hormones & Genes

    Folate vs Folic Acid and MTHFR: What the Evidence Actually Supports

    Folic acid prevents neural-tube defects. Methylfolate marketing is not a free rewrite of CDC guidance.

    MARCUS CHEN 4 MIN READ

  16. Hormones & Genes

    MTHFR Gene Variants: What Actually Matters Clinically

    C677T and A1298C explained with ACMG non-utility, CDC folic acid facts, and riboflavin research graded honestly.

    MARCUS CHEN 8 MIN READ

  17. Hormones & Genes

    Birth Control in Tap Water: Human Dose Bridge vs the Pill

    Picograms and nanograms per day versus 20–35 µg ethinylestradiol—orders of magnitude matter.

    ELENA VOSS 4 MIN READ

  18. Hormones & Genes

    Birth Control Hormones in Drinking Water: Dose, Ecology & Human Risk

    EE2 and related estrogens in water explained with ng/L units — real fish ecology risk, orders-of-magnitude human dose bridge versus oral contraceptives, treatment fate, regulation, and proportionate mitigation.

    ELENA VOSS 8 MIN READ

  19. Hormones & Genes

    Allergens & Inflammation: IgE, Type 2 Pathways, CRP & MCAS Claims

    Allergy is not the same as systemic inflammation. Separates IgE from non-IgE disease, maps Type 2 pathways, covers Big 9 foods and LEAP, hs-CRP bands, MCAS triad criteria, and lifestyle adjuncts that do not replace epinephrine.

    MARCUS CHEN 8 MIN READ

  20. Hormones & Genes

    ACMG MTHFR Testing Guidance: Why Routine SNP Orders Are Discouraged

    ACMG: do not order MTHFR polymorphism testing for thrombophilia or recurrent pregnancy loss. Fortification-era evidence dismantled the old causal chain.

    MARCUS CHEN 6 MIN READ

Frequently asked

About Hormones & Genes

Does tap water lower men's testosterone via birth control?
Finished-water estrogen PECs are typically nanograms-per-liter class intakes — orders of magnitude below oral contraceptive microgram doses. Fish feminization at low ng/L is real ecology; human municipal contraceptive-dose claims fail the dose bridge in mainstream assessments.
Who should worry about iron overload?
Northern European ancestry C282Y homozygotes with elevated transferrin saturation and ferritin need clinical evaluation. Men present earlier on average; menstrual blood loss can delay expression in women until midlife. Alcohol multiplies liver risk.
Should MTHFR change prenatal vitamins?
CDC-class guidance is that people with common MTHFR variants can process folic acid; folic acid is the form with population neural-tube-defect prevention proof. Do not abandon proven folic acid based on unvalidated methylfolate-only marketing.