Histamine Well Podcast: Exploring Histamine, Methylation & Holistic Health · Joanne Kennedy

27. Why Blood Tests & Functional Medicine Tests Aren’t the Full Story: Gut, Histamines, Genes, Hormones & More!

·47 min·2 clips

An MTHFR mutation can lead to the wrong supplement when estrogen is driving overmethylation.

1. Histamine Well Podcast: Exploring Histamine, Methylation & Holistic Health episode 27 focuses on why blood tests and functional medicine tests do not tell the full story. 2. Joanne Kennedy hosts with Mariela Gebhardt, a naturopath based in Austria, and both speak from clinical practice with practitioners and patients. 3. The episode asks how to interpret tests without losing the patient’s symptoms, exposures, and timeline. 4. Candida testing comes first, and Mariella says stool microbiome tests can miss candida when case history shows carbohydrate cravings, sweet tooth, recurrent rash, or brain fog. 5. They contrast stool testing with urine metabolites on an organic acid test, which can show higher candida production even when the stool report looks negative. 6. Mold exposure is tied into that picture through aribinose, gliotoxin, fungal overgrowth, and the observation that yeast-like patterns often travel with mold illness. 7. Vaginal symptoms are another example, because an itchy, sore, red vagina can reflect bacterial vaginosis or a disrupted pH rather than candida. 8. Mariella also mentions Marcon's testing and nasal candida, showing that site-specific symptoms can matter more than a single negative swab. 9. For mold, Joanne and Mariella say mycotoxin tests vary by lab and can miss the exposure someone actually has. 10. They also warn that a negative urine mycotoxin result can happen when someone has not provoked detox pathways with glutathione or N-acetylcysteine. 11. Joanne says she has seen low DAO mostly in mold illness, which frames histamine as a bucket rather than a single lab value. 12. They explain that whole-blood histamine can be normal or low while gut histamine, estrogen, stress, and methylation still drive symptoms. 13. Gene testing is treated as an example of outdated thinking, especially when MTHFR results are used to justify methyl folate without context. 14. Joanne gives a patient example where estrogen pushed overmethylation, and methyl folate left her crying and clinically worse. 15. They make the same point with DAO, copper, glutathione genes, sulfur genes, and COMT, because substrate overload and inflammation can matter more than a SNP. 16. The at-home Mood Sense saliva swab is presented as a real-time methylation test that can show overmethylation or undermethylation directly. 17. The tone is clinical, conversational, and strongly practical, with Joanne and Mariella checking each other’s examples as they go. 18. The format feels like an educator-to-educator discussion, and Joanne pauses to address practitioners, students, and patients separately. 19. Practitioners who read lab work for histamine, mold, or methylation would likely benefit most. 20. Listeners who want a light general wellness chat or a nontechnical introduction may skip it.

As heard by us

A grounded reminder that normal results are not the whole story.

Joanne makes the case that functional medicine testing can be useful without treating it like final truth. False negatives can happen, a gene result does not always point to trouble, and hormone panels may look fine even when a person still feels unwell.

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When your labs look normal but your symptoms do not.

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