What foods are good for Thyroid?

Beneficial foods include Iodised Salt, Iodized Salt, Brazil Nut, Salt, Iron, Selenium, Coconut Oil. Iodised salt, selenium-rich foods (eggs, seeds), and balanced whole foods.

What foods should I limit or avoid with Thyroid?

Limit or avoid Potassium Bromate, Seaweed, Ashwagandha, Soy Sauce, Gluten, Wheat, Refined Wheat Flour, All Purpose Flour, Semolina, Barley. Excess raw cruciferous vegetables and unfermented soy in large amounts.

Thyroid: Foods to Eat & Avoid

Thyroid health benefits from adequate iodine and selenium, with care around goitrogens.

Key principles

Adequate iodine + selenium
Cook goitrogenic vegetables

Foods to eat

Iodised Salt — Provides the essential dietary iodine required by the thyroid gland to synthesize thyroxine (T4) and triiodothyronine (T3) hormones. Use iodised salt instead of non-iodised salt for everyday cooking to meet baseline iodine requirements. [ICMR-NIN, PubMed]
Iodized Salt — Iodine is the primary substrate used by the thyroid gland to synthesize thyroid hormones (T3 and T4), which regulate overall metabolic rate. Incorporate iodized salt in daily cooking within recommended limits to support healthy thyroid function and prevent deficiency disorders. [ICMR-NIN, PubMed]
Brazil Nut — Selenium is a critical cofactor for enzymes like iodothyronine deiodinases, which convert thyroxine (T4) to the active thyroid hormone triiodothyronine (T3), and helps protect the thyroid gland from oxidative damage. Incorporate Brazil nuts in strict moderation (typically 1 to 2 nuts per day) to support thyroid health without exceeding the safe upper tolerable limit for selenium. [USDA, PubMed]
Salt — Iodine present in iodized salt is a critical substrate for the synthesis of thyroid hormones (thyroxine and triiodothyronine). Ensure you are using iodized salt rather than non-iodized varieties to meet baseline thyroid needs, while keeping total salt intake within safe limits. [ICMR-NIN, FSSAI]
Iron — The enzyme thyroid peroxidase (TPO), which is essential for the synthesis of thyroid hormones, requires iron as a cofactor; hence, iron deficiency can impair thyroid metabolism. Maintaining adequate iron levels through diet is a helpful step to support overall thyroid health, especially if you have a history of thyroid sluggishness. [PubMed]
Selenium — Selenium-dependent enzymes (iodothyronine deiodinases) are essential for converting thyroxine (T4) into the active thyroid hormone triiodothyronine (T3). Incorporate selenium-rich foods such as whole grains, seeds, and mushrooms to support healthy thyroid function. [ICMR-NIN, PubMed]
Coconut Oil — Contains medium-chain triglycerides (MCTs) which provide an easily accessible energy source to help support metabolic rate. Use in moderation as a healthy cooking oil option within a balanced fat intake plan. [PubMed]

Foods to limit or avoid

Potassium Bromate — Toxicological evidence indicates that exposure can cause follicular cell hypertrophy and increases the risk of thyroid tumors. Avoid exposure to flour bleaching agents or industrial bakery ingredients that have not been certified bromate-free. [PubMed]
Seaweed — Seaweeds are exceptionally rich in iodine. While moderate iodine is necessary for thyroid function, excess intake can provoke thyroid dysfunction, including goiter, hypothyroidism, or hyperthyroidism. Incorporate seaweed in small, controlled portions and consult a doctor if you have pre-existing thyroid conditions. [PubMed]
Ashwagandha — May stimulate thyroid function, potentially increasing the production of T3 and T4 hormones. While potentially helpful for mild hypothyroidism, individuals with hyperthyroidism should exercise caution and consult a healthcare provider. [PubMed]
Soy Sauce — Derived from fermented and unfermented soy; contains both goitrogens and exceptionally high sodium levels which may aggravate autoimmune conditions. Avoid or limit the use of soy-sauce in your diet. [PubMed]
Gluten — Structural similarity (molecular mimicry) between gluten proteins and thyroid tissue can trigger or aggravate autoimmune attacks in Hashimoto's thyroiditis. Consider minimizing or avoiding gluten-containing foods if diagnosed with autoimmune thyroiditis. [PubMed]
Wheat — As a primary source of gluten, wheat can provoke an immune response that cross-reacts with thyroid tissue in autoimmune thyroiditis. Limit wheat consumption or trial a gluten-free diet if managing Hashimoto's. [PubMed]
Refined Wheat Flour — Contains gluten which can exacerbate autoimmune-mediated thyroid injury, while also promoting systemic glycemic inflammation. Limit refined wheat products like maida to support thyroid and metabolic health. [PubMed]
All Purpose Flour — High gluten content may trigger inflammatory or autoimmune cross-reactions that adversely affect thyroid tissue in sensitive individuals. Limit or avoid in diets tailored for autoimmune thyroid conditions. [PubMed]
Semolina — Derived from durum wheat and contains gluten, posing a risk of autoimmune cross-reactivity for Hashimoto's patients. Restrict intake if you are avoiding gluten to manage thyroid inflammation. [PubMed]
Barley — Contains gluten, which is associated with increased autoimmune antibodies that can target the thyroid gland. Avoid or limit barley if you have gluten-sensitive autoimmune thyroid disease. [PubMed]
Sugar — Refined sugars promote systemic inflammation and insulin resistance, which can worsen autoimmune thyroid symptoms and metabolic dysfunction. Limit added sugar intake to support inflammatory balance and thyroid health. [ICMR-NIN, WHO, PubMed]
High Fructose Corn Syrup — Exacerbates metabolic dysfunction, promotes fatty liver, and increases systemic inflammatory markers that negatively impact autoimmune thyroid disease. Avoid foods containing high-fructose corn syrup. [ICMR-NIN, WHO, PubMed]
Hfcs — Acts as a potent driver of systemic inflammation and metabolic syndrome, compounding thyroid-related slow metabolism. Avoid or strictly limit foods with hfcs on the label. [ICMR-NIN, WHO, PubMed]
Fructose — Excess free fructose consumption is linked to metabolic stress and inflammation, which can complicate thyroid hormone regulation. Limit processed foods sweetened with added fructose. [ICMR-NIN, WHO, PubMed]
Corn Syrup — Highly refined carbohydrate that triggers glucose spikes and systemic inflammation, worsening Hashimoto's flare-ups. Avoid foods containing processed corn syrup. [ICMR-NIN, WHO, PubMed]
Calcium Carbonate — Calcium carbonate can bind to thyroid hormone replacement medications (such as levothyroxine) in the gastrointestinal tract, reducing their absorption and efficacy. Ensure a gap of at least 4 hours between consuming calcium carbonate-containing products and taking thyroid hormone medication. [PubMed]
Bajra — Contains phenolic compounds that may inhibit the thyroid peroxidase enzyme, potentially restricting iodine uptake. Consume in moderate, well-cooked quantities if you have pre-existing hypothyroidism, and ensure adequate dietary iodine intake. [PubMed]
Raw Cruciferous — Raw cruciferous vegetables release isothiocyanates and thiocyanates that compete with iodine uptake in the thyroid gland, potentially suppressing thyroid hormone production. Individuals with hypothyroidism or iodine deficiency should limit raw consumption and opt for steamed or cooked cruciferous vegetables, which deactivates the goitrogenic enzymes. [PubMed]
E320 — Certain peer-reviewed toxicological assessments indicate that BHA may act as a mild endocrine disruptor at high concentrations, potentially interfering with thyroid hormone homeostasis. Individuals with thyroid conditions may choose to minimize highly processed foods containing synthetic preservatives as a conservative dietary measure. [PubMed]
Bht — Certain rodent models suggest high doses of BHT may interfere with thyroid hormone metabolism, though evidence of this effect in humans at standard dietary exposure levels is weak. Those managing thyroid conditions may prefer to limit highly processed packaged foods containing synthetic preservatives in favor of fresh alternatives. [PubMed]
Soy Milk — Soy isoflavones can act as goitrogens and potentially interfere with thyroid hormone synthesis or the absorption of thyroid replacement medications. Individuals with hypothyroidism should ensure adequate iodine intake and space their soy milk consumption at least 4 hours apart from thyroid medication. [PubMed]
Soy — Soy isoflavones can act as mild goitrogens and may interfere with the absorption of synthetic thyroid hormone medication (levothyroxine), especially in diets deficient in iodine. Ensure adequate dietary iodine intake, and consume soy foods consistently while keeping a gap of at least 4 hours after taking thyroid medication. [PubMed]
Coffee — Caffeine and other compounds in coffee significantly impair the intestinal absorption of thyroid hormone replacement medications. Avoid drinking coffee for at least 60 minutes after taking your daily thyroid medication. [PubMed]
Walnut — High fiber and specific compounds in walnuts can bind to and decrease the absorption of thyroid hormone replacement therapy. Do not consume walnuts within 4 hours of taking your thyroid medication. [PubMed]
Isabgol — Bulk-forming laxative fiber that can bind to levothyroxine in the gut, reducing its clinical efficacy. Take isabgol or fiber supplements at least 4 hours apart from your thyroid medication. [PubMed]
Psyllium — High soluble fiber content reduces the bioavailability of oral thyroid hormone replacement doses. Separate psyllium intake from your thyroid medication by at least 4 hours. [PubMed]
Lactose — Lactose intolerance is highly prevalent in patients with Hashimoto's thyroiditis and can interfere with the stable absorption of thyroid medication. Limit lactose if you experience gastrointestinal distress or erratic thyroid hormone levels. [PubMed]
Cabbage — Glucosinolates (goitrogens) present in raw cabbage can compete with iodine uptake, potentially affecting thyroid function in predisposed individuals. Cook, steam, or boil cabbage thoroughly to significantly reduce goitrogenic activity; avoid raw cabbage juice in large quantities if diagnosed with hypothyroidism. [PubMed]
Ragi — Contains dietary goitrogens which, in large unheated quantities, can potentially inhibit iodine uptake by the thyroid gland. Ensure ragi is thoroughly cooked, baked, or fermented. Individuals with clinical hypothyroidism should consume it as part of a varied diet while maintaining adequate iodine intake. [PubMed]
Cauliflower — Cruciferous vegetables contain goitrogens (like thiocyanates) which can compete with iodine uptake in the thyroid gland. Consume cooked cauliflower rather than raw, as cooking deactivates most goitrogenic compounds, and ensure adequate dietary iodine intake. [PubMed]
Jowar — Contains goitrogenic compounds (cyanogenic glycosides) which may theoretically interfere with iodine uptake in the thyroid gland if consumed raw or in excessive amounts. Ensure Jowar is thoroughly cooked, and consume it as part of a diverse diet with adequate iodine intake. [PubMed]
Soya — Soy isoflavones can potentially inhibit thyroid peroxidase, the enzyme responsible for thyroid hormone synthesis, primarily when iodine intake is deficient. Individuals with hypothyroidism should ensure adequate iodine intake and consult their physician regarding the timing of soy consumption relative to thyroid medication. [PubMed]
Soybean — Soy isoflavones can act as dietary goitrogens, potentially inhibiting thyroid peroxidase and interfering with thyroid hormone synthesis in individuals with borderline thyroid function or inadequate iodine intake. Avoid excessive intake of raw or minimally processed soy if diagnosed with hypothyroidism, and ensure adequate dietary iodine consumption. [PubMed]
Millets — Certain flavonoids in pearl millet (bajra) can interfere with thyroid peroxidase activity, potentially reducing thyroid hormone synthesis if iodine intake is insufficient. People with hypothyroidism may consume millets in moderation, ensuring proper cooking/processing and adequate dietary iodine. [ICMR-NIN, PubMed]
Broccoli — Contains goitrogens (isothiocyanates) that can inhibit iodine uptake by the thyroid gland when raw broccoli is consumed in excess. Cook, steam, or blanch broccoli before consumption, as heat deactivates most of the goitrogenic compounds. [PubMed]
Flaxseed — Raw flaxseeds contain cyanogenic glycosides which can theoretically act as mild goitrogens by competing with iodine uptake in the thyroid gland, especially under iodine-deficient conditions. Individuals with thyroid disorders should prefer cooked or toasted flaxseeds over raw ones and ensure sufficient dietary iodine intake. [PubMed]
Tapioca — Cassava root naturally contains cyanogenic glucosides which, if inadequately processed, can yield thiocyanate and compete with iodine uptake in the thyroid gland. Ensure tapioca is purchased from commercial sources where thorough processing removes these compounds, and maintain adequate dietary iodine intake. [PubMed]

Educational information only — not medical advice. Consult a qualified doctor or dietitian before changing your diet, especially for a medical condition.

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