Hashimoto’s Diet Plan: What to Eat and What to Avoid to Feel Better
- May 27, 2025
- 5 min read
Updated: Nov 11, 2025
If you’ve been diagnosed with Hashimoto’s or suspect you’re dealing with it, you’ve probably wondered what you should actually eat. With so much conflicting advice online - "go gluten-free," "cut out dairy," "go keto," "carnivore fixes everything," "try AIP," "you have to eat low-carb" - it’s easy to feel overwhelmed or stuck.
You're in luck! I read all the research and wrote my master's thesis on this. So, let’s clear things up by focusing on what supports your immune system, balances your blood sugar, and calms the inflammation driving Hashimoto’s in the first place.
What to Avoid
Gluten and Cross-Reactive Foods
Gluten is one of the most researched triggers for autoimmune thyroid flare-ups, even if you don’t have celiac disease. Your immune system can mistake gluten for your thyroid tissue through a process called molecular mimicry. Also, it’s not only gluten! Other foods like dairy, corn, oats, and rice can act as cross-reactive triggers for some people, keeping the immune system on high alert.
High-Sugar and High-Carb Processed Foods
Blood sugar spikes and crashes drive inflammation, hormone imbalance, and fatigue. Even “healthy” processed foods like gluten-free bread, paleo treats, or grain-free crackers can spike your blood sugar if they are low in protein or fiber. Also, in America, gluten free processed foods can have some gluten in them. If you eat a few servings of a gluten free treat or a few different ones in a day, it can easily add up to enough to trigger your immune system.
Low-Carb, Keto & Carnivore Diets
While cutting carbs may feel good at first, these approaches often backfire over time. They can put extra stress on your nervous system and worsen thyroid hormone conversion, since your body needs insulin to convert T4 to T3. Low-carb and carnivore diets can also increase thyroid-binding globulin (TBG) and sex hormone-binding globulin (SHBG), reducing the amount of free thyroid and sex hormones available to your cells. Additionally, going too low in carbs may reduce insulin receptor expression, which can worsen insulin resistance and make it harder for your body to use glucose effectively. If you already feel fatigued, anxious, or struggle with blood sugar instability, cutting carbs too low may make things worse, not better.
Fasting or Skipping Meals
Intermittent fasting can work for some, but many women with Hashimoto’s already deal with adrenal stress and blood sugar instability. Skipping meals may cause low blood sugar, anxiety or fatigue, and hormone imbalances. If you aren’t sleeping well or are already feeling drained, you’ll likely feel better eating regular, balanced meals to stabilize your energy.
What to Focus On Instead
Protein with Every Meal
Protein helps stabilize blood sugar, supports hormone production, and provides building blocks for immune health.
Colorful Fruits, Vegetables & Herbs
They are packed with antioxidants, fiber, and nutrients to reduce inflammation and feed your good gut bacteria. Aim to include a variety of colors each week.
Healthy Fats
Fats are the building blocks of our hormones! They also are key players in brain health, and blood sugar balance. Include avocado, olive oil, coconut oil, and wild-caught fish. It's also advisable to limit processed seed oils (such as soybean, corn, and sunflower oil) as they're high in omega-6 fatty acids. While omega-6s are essential, an imbalanced ratio compared to omega-3s may contribute to inflammation in the body. Additionally, these oils often undergo industrial processing methods that include high heat and chemical solvents like hexane, which can strip away nutrients and potentially leave behind trace residues. Opting for minimally processed oils can support overall health and reduce exposure to unnecessary additives.
Whole Food Carbohydrates
Fuel your body, support your thyroid, and keep blood sugar stable when paired with protein and fat. Focus on fiber rich carbs over simple, processed ones. The fiber feeds your microbiome, helps you feel more full, and binds up toxins so your body can get rid of them.
↣ Root veggies: sweet potatoes, carrots, beets, parsnips, rutabaga
↣ Winter squash: butternut, acorn, kabocha, spaghetti
↣ Gluten-free whole grains: quinoa, buckwheat, millet, amaranth, brown or black rice, certified GF oats
↣ Legumes (if tolerated): lentils, chickpeas, black beans, mung beans
↣ Fruit: berries, apples, pears, bananas, mango, grapes, kiwi
↣ Starchy veggies: peas, corn, plantains
↣ Nuts & seeds: chia, flax, hemp, pumpkin seeds (bonus: protein and fat, too!)
↣ Veggies: leafy greens, broccoli, Brussels sprouts, cauliflower, cabbage (all technically carbs with loads of fiber and micronutrients)
Thyroid-Supportive Nutrients
Selenium (Brazil nuts, seafood)
Supports thyroid hormone conversion (T4 to T3)
Helps reduce thyroid antibodies and calm inflammation
Provides antioxidant protection to thyroid cells
Zinc (oysters, pumpkin seeds)
Essential for thyroid hormone production and release
Supports a balanced immune response
Helps maintain healthy hair and nails (often affected by thyroid imbalances)
Magnesium (leafy greens, seeds)
Involved in over 300 enzymatic reactions, including blood sugar regulation
Supports adrenal health and stress resilience
Helps muscles relax and reduces cramping or tension
B Vitamins (animal proteins, leafy greens)
Crucial for energy production and metabolism
Support methylation and detoxification pathways
Important for nerve health and mood stability
Iron (grass-fed beef, spinach, lentils)
Needed for thyroid peroxidase (TPO) enzyme to produce thyroid hormones
Supports oxygen transport throughout the body
Deficiency can worsen fatigue and hair thinning
Vitamin D (fatty fish, egg yolks, mushrooms)
Helps modulate the immune system and reduce autoimmunity risk
Supports bone health and calcium absorption
Plays a role in mood balance and energy levels
Iodine (seaweed, fish, iodized salt in moderation)
Required for the production of thyroid hormones (T4 and T3)
Supports healthy metabolism and energy production
Caution: While iodine is essential, too much can trigger thyroid flares, especially in autoimmune thyroid conditions like Hashimoto’s. It’s best to test iodine levels and work with a practitioner before supplementing or dramatically increasing iodine-rich foods.
How to Personalize It Even More
Even healthy foods can trigger your immune system if you have hidden food sensitivities. That’s where food sensitivity tests like the MRT (Mediator Release Test) comes in. This test helps identify your personal food triggers, so you can lower inflammation more effectively and feel better faster. You can also try the AIP diet, but sometimes even foods on there can trigger your immune system (this was my personal experience).
Next Steps
Download my free Thyroid Lab Guide to make sure you’re testing the right markers.
Fill out my contact form if you’re ready to explore functional testing or a personalized plan.
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Disclaimer: I do not diagnose, treat, prevent, or cure any disease or condition. Nothing I share with my clients is intended to substitute for the advice, treatment or diagnosis of a qualified licensed physician. I may not make any medical diagnoses or claim, nor substitute for your personal physician’s care. It is my role to partner with you to provide ongoing support and accountability in an opt-in model of self-care and any changes should be done under the supervision of a licensed physician.
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