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MICROBIOME AND THYROID
(PART OF THE CYCLE OF ILLNESS: IMMUNE SYSTEM PART 3 / HOW THE MICROBIOME AFFECTS OTHER SYSTEMS)
THESE ARE THE SLIDES TO THE VIDEOS AND THE NOTES
The gut microbiome plays a significant role in thyroid health, with evidence suggesting a "gut-thyroid axis" where imbalances in the gut microbiota can affect thyroid function and vice versa. This axis is particularly relevant in autoimmune thyroid diseases like Hashimoto's thyroiditis and Graves' disease.
How the Microbiome Influences Thyroid Function:
Micronutrient Availability:
The gut microbiota influences the availability of essential micronutrients like iodine, iron, copper, selenium, and zinc, which are crucial for thyroid hormone synthesis and conversion.
Immune System Regulation:
The gut microbiota impacts the immune system, which is closely linked to autoimmune thyroid diseases. Dysbiosis (microbial imbalance) can contribute to the development or progression of conditions like Hashimoto's and Graves' disease.
Metabolite Production:
Gut microbes produce short-chain fatty acids (SCFAs) and other metabolites that can affect thyroid hormone levels and the thyroid's response to stimuli.
Thyroid Hormone Metabolism:
The gut microbiome can influence the conversion of the less active thyroid hormone (T4) to the more active form (T3), which is important for overall metabolic function.
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How Thyroid Function Affects the Microbiome:
Bidirectional Relationship:
The relationship between the gut and thyroid is bidirectional, meaning that thyroid hormones can also affect the composition and function of the gut microbiota.
Impact on Gut Motility and Permeability:
Thyroid hormones influence gut motility (the movement of food through the digestive tract) and permeability (how easily substances pass through the gut lining). Imbalances in thyroid function can lead to changes in these processes, potentially affecting the microbiome.
Hashimoto's and Graves' disease are often associated with gut dysbiosis and can be influenced by the gut microbiome's impact on the immune system.
Understanding the gut-thyroid axis opens up possibilities for therapeutic interventions, such as using probiotics or fecal microbiota transplantation to modulate the gut microbiome and potentially improve thyroid health.
1. Nourish Thyroid-Specific Nutrients
••Iodine – needed to make thyroid hormones (be cautious if you have Hashimoto’s)
•Selenium – converts T4 → T3 and reduces antibodies→ Brazil nuts, sardines, sunflower seeds
•Zinc – supports TSH and immune function
•Iron – needed for TPO enzyme and hormone synthesis
•Tyrosine –amino acid used to make thyroid hormones
•Vitamin D – regulates immune system and inflammation
•Magnesium – balances the HPA-thyroid axis
•B Vitamins – help methylation, energy, and hormone balance
2. Adopt a Thyroid-Healing Diet
•Anti-inflammatory, gluten-free is often recommended (especially in autoimmunity)
•Emphasize whole foods: veggies, wild fish, healthy fats, organic proteins
•Remove triggers:
•Gluten (can cross-react with thyroid tissue)
•Dairy (in sensitive individuals)
•Soy (can disrupt hormones in excess)
•Processed foods & refined sugar
•Increase fiber to help clear excess hormones and toxins
3. Balance the HPA Axis (Stress-Response System)
•Chronic stress = cortisol → suppresses thyroid hormone conversion
•Healing tips:
•Breathwork & meditation
•Vagus nerve stimulation
•Gentle movement (yoga, walking)
•Ashwagandha, rhodiola, and holy basil (adaptogens)
4. Heal the Gut
•Leaky gut and dysbiosis are often root causes of Hashimoto’s and thyroid autoimmunity
•Strategies:
•Probiotics (Lactobacillus, Bifidobacterium)
•Prebiotic foods (onions, garlic, asparagus, apples)
•Bone broth, L-glutamine, zinc carnosine
•Address SIBO, candida, or gut infections if present
5. Calm Autoimmunity (for Hashimoto’s)
•Identify and remove immune triggers (infections, toxins, foods)
•Support regulatory T cells (vitamin D, fish oil, probiotics, glutathione)
•Reduce toxic burden: filter water, clean skincare, avoid plastics/BPA
6. Get Proper Thyroid Testing
Ask for a complete thyroid panel:
•TSH
•Free T3
•Free T4
•Reverse T3
•Thyroid antibodies: TPOAb, TgAb
•Consider testing cortisol, iron, B12, ferritin, and vitamin D levels
7. Work with a Practitioner
•Consider natural thyroid support (herbal blends, glandulars, low-dose NDT)
•If needed, bioidentical or synthetic thyroid hormone (levothyroxine or desiccated thyroid)
•Monitor symptoms, not just labs!
Further Research Needed: While the connection between the gut microbiome and thyroid is becoming clearer, more research is needed to fully understand the complex interplay and to develop effective, personalized approaches to managing thyroid conditions
REFERENCES:
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