Tips to Reduce Your Risk of Autoimmune Thyroid Conditions
Disclaimer***
Just like any disease state, autoimmune thyroid conditions are subject to genetic influence and multifaceted causation. These tips are only some of the ways you can reduce your risk and are not a guarantee. It is advised to work with a qualified practitioner to investigate your individual root causes.
Reduce you stress load
Why it matters: Prolonged psychological stress dysregulates the immune system and is a well-recognised trigger for autoimmune conditions.
The research: Studies have found a significant correlation between the number of stressful life events and TPO antibodies (Hashimoto’s) over the course of 12 months.
How to optimise: Practices like mindfulness / grounding, regular exercise (weight bearing or cardio), and adequate sleep all help modulate immune function in ways that may be protective.
Stress is personal to you. However a profound way to shift your stress levels is to adapt your environment and remove triggers or habits that perpetuate this cycle. Whether it be shift work, living above your means, a draining relationship, or a daily routine that leaves no room for rest — small, intentional changes to your environment can have a transformative impact on your long-term health.
2. Protect your gut health
Why it matters: The gut is home to approximately 70% of the immune system — making it one of the most powerful influencers of immune regulation in the body.
The research: Increased intestinal permeability ("leaky gut") has been associated with autoimmune conditions as the breakdown of proteins that line the intestinal wall result in bacteria, toxins, undigested dietary proteins and other irritants passing into the bloodstream, increasing inflammation and immune system activation throughout the body.
To support gut health and reduce immune activation:
Eat plenty of fibre — aim for 25–30g daily from whole food sources
Include fermented foods — natural source of probiotics to support microbial diversity
Include prebiotics — feed your beneficial bacteria with garlic, leeks, and asparagus
Add gut-repairing nutrients — zinc, vitamin A, L-glutamine, and omega-3s support gut wall integrity
Limit ultra-processed foods and alcohol — both drive inflammation and disrupt microbial balance
3. Maintain sufficient vitamin D levels
Why it matters: Vitamin D is less of a vitamin and more of a hormone — influencing hundreds of processes in the body, including how the immune system behaves.
The research: Studies show that vitamin D levels have direct effects in regulating immune activity and reducing autoantibody formation, which means low levels can create a higher incidence of autoimmune diseases in general, including Hashimoto’s and Grave’s.
Optimal levels: Conventional medicine generally considers vitamin D sufficient at levels above 50 nmol/L, however many functional and integrative practitioners aim for 100–150 nmol/L for optimal immune protective effects.
How to optimise: Safe sun exposure is the most natural source, though supplementation is often necessary, particularly in countries with limited sunlight or during the winter months.
4. Maintain sufficient selenium levels
Why it matters: The thyroid contains the highest concentration of selenium per gram of tissue of any organ in the body, highlighting its importance. Selenium-dependent enzymes (deiodinases) are responsible for converting T4 into the active form T3 — meaning even a well-functioning thyroid can result in poor hormonal output if selenium is insufficient.
The research: Low selenium levels are consistently associated with elevated TPO antibodies, and studies have shown that selenium supplementation can significantly reduce antibody levels in those with Hashimoto's thyroiditis.
How to optimise: Selenium is best obtained through diet. Brazil nuts are the richest source — just 1–2 per day can meet your daily requirements. Other good sources include sardines, eggs, sunflower seeds, and organ meats.
Supplementation should be approached with caution as selenium has a narrow therapeutic window — meaning the gap between optimal and toxic intake is smaller than most nutrients.
5. Limit exposure
The modern environment exposes us to hundreds of chemicals daily — many of which are known endocrine disruptors that interfere with thyroid hormone production, transport, and receptor binding.
The key offenders:
BPA & plastics — found in food packaging and plastic bottles, BPA directly interferes with thyroid hormone signalling at the receptor level
Pesticides — associated with increased thyroid dysfunction and autoimmune thyroid risk
Heavy metals — mercury in particular competes with selenium and iodine at a cellular level, directly impairing thyroid function
Fluoride — accumulates in the thyroid and interferes with iodine uptake and hormone synthesis
Practical steps:
Switch to glass, stainless steel, or ceramic containers
Avoid heating food in plastic
Filter your drinking water
Choose organic produce where possible
Support liver detoxification through cruciferous vegetables and antioxidant rich foods
Complete elimination is not realistic — the goal is meaningful reduction over time.
6. Regulate blood sugar levels
Chronic blood sugar imbalances drive elevated cortisol, which directly suppresses TSH secretion, impairs T4 to T3 conversion, and promotes immune dysregulation — all of which increase autoimmune thyroid risk.
The key mechanisms:
Insulin resistance — chronically elevated insulin promotes inflammation, drives oestrogen dominance, and impairs thyroid hormone receptor sensitivity
Cortisol spikes — blood sugar crashes trigger a cortisol response, which over time suppresses the HPT axis and shifts T4 conversion toward inactive reverse T3
Chronic inflammation — unstable blood sugar drives low grade systemic inflammation, one of the core triggers of autoimmune activity
Practical steps:
Prioritise protein and healthy fats at every meal to stabilise blood sugar
Reduce refined carbohydrates, sugary drinks, and ultra-processed foods
Avoid skipping meals — particularly breakfast
Move your body after meals — even a 10 minute walk significantly improves glucose uptake
Prioritise sleep — even one night of poor sleep impairs insulin sensitivity
