Hypothyroidism is a condition in which the thyroid gland does not produce enough thyroid hormone to meet the body’s needs. Because thyroid hormones regulate metabolism, body temperature, heart rate, digestion, energy levels, and weight, an underactive thyroid affects virtually every system in the body. The most common symptoms include persistent fatigue, unexplained weight gain, difficulty losing weight, brain fog, constipation, dry skin, hair thinning, cold intolerance, and low mood.
Hashimoto’s thyroiditis, an autoimmune condition in which the immune system gradually attacks and damages the thyroid gland, is the most common cause of hypothyroidism in developed countries. Other causes include thyroid surgery, radioiodine treatment, certain medications, and iodine deficiency.
No diet cures hypothyroidism or replaces thyroid hormone medication such as levothyroxine. However, what you eat has a direct impact on thyroid hormone production, the conversion of inactive T4 to active T3, the absorption of thyroid medication, inflammation levels, gut health, and the specific nutrient deficiencies that most commonly accompany hypothyroidism. Research published in Nutrients confirms that dietary patterns significantly influence thyroid function, autoimmune activity, and the severity of hypothyroidism symptoms independent of medication status.
This is the complete hypothyroidism diet grocery list: what to buy to support thyroid function, what to limit or avoid, and how to eat in a way that works with your thyroid rather than against it. If your hypothyroidism stems specifically from Hashimoto’s, also see our Hashimoto’s thyroiditis diet grocery list for the added autoimmune-specific considerations, our 7-Day Hypothyroid Diet Meal Plan for a ready-made week of meals built from this list, and our guide to losing weight with hypothyroidism for the exercise side of the picture.
How Diet Affects Thyroid Function
The thyroid requires specific nutrients to produce thyroid hormones and convert them into their active form. Deficiencies in iodine, selenium, zinc, and iron directly impair these processes. Certain foods, particularly raw cruciferous vegetables, soy in large amounts, and gluten in people with Hashimoto’s, can interfere with thyroid hormone production or absorption. Chronic inflammation, which is driven substantially by dietary choices, worsens autoimmune thyroid activity in Hashimoto’s patients.
The American Thyroid Association notes that while no single diet has been proven to treat hypothyroidism, optimizing nutrient intake and reducing dietary inflammation are evidence-based strategies for supporting thyroid health alongside medical treatment.
The four key dietary priorities for hypothyroidism are: ensuring adequate intake of thyroid-essential nutrients (iodine, selenium, zinc, iron), reducing dietary inflammation, supporting gut health (especially critical in Hashimoto’s, which is strongly associated with intestinal permeability), and being strategic about foods and timing that can interfere with thyroid medication absorption.
Thyroid Medication and Food: The Timing Rule
If you take levothyroxine or any other thyroid hormone replacement, the most important dietary rule applies before breakfast: take your medication on an empty stomach with a full glass of water, 30 to 60 minutes before eating or drinking anything other than water. Several foods and supplements significantly reduce levothyroxine absorption when consumed too close to the dose.
Foods and supplements that interfere with levothyroxine absorption (take at least 4 hours apart from medication):
- Calcium-rich foods and calcium supplements
- Iron supplements and high-iron foods consumed in large amounts at medication time
- Coffee (reduces absorption by up to 36% when consumed within one hour of the dose)
- High-fiber foods consumed in large amounts immediately after the dose
- Soy foods in large amounts
- Walnuts
- Antacids containing calcium or aluminum
This is a timing issue, not a permanent avoidance issue. All of these foods are healthy and appropriate for a hypothyroidism diet; the key is not consuming large amounts within 30 to 60 minutes of your medication.
Hypothyroidism Diet Foods List: What to Buy
Iodine-Rich Foods (Essential for Thyroid Hormone Production)
Iodine is the primary raw material the thyroid uses to manufacture thyroid hormones T3 and T4. Without adequate iodine, the thyroid cannot produce sufficient hormones regardless of any other dietary intervention. The National Institutes of Health Office of Dietary Supplements recommends 150mcg of iodine daily for adults, rising to 220mcg during pregnancy.
Best dietary sources of iodine:
- Seaweed (nori, wakame, kombu; nori is the most practical; eat in moderate amounts as excess iodine can paradoxically worsen hypothyroidism)
- Cod and other white fish
- Shrimp and other shellfish
- Canned tuna in water
- Iodized salt (use in cooking; non-iodized sea salt and Himalayan salt do not contain iodine)
- Low-fat milk and plain yogurt
- Eggs (particularly the yolk)
Important note on iodine: More is not better with iodine and thyroid health. Excess iodine intake, particularly from high-dose supplements or excessive seaweed consumption, can worsen both hypothyroidism and Hashimoto’s in some individuals. Get iodine from food sources rather than high-dose supplements unless specifically directed by your doctor.
Selenium-Rich Foods (Critical for T4 to T3 Conversion)
Selenium is the second most critical nutrient for thyroid health. The thyroid contains more selenium per gram of tissue than almost any other organ in the body. Selenium-dependent enzymes called deiodinases convert the inactive thyroid hormone T4 into the active T3 that cells actually use. Selenium also protects the thyroid gland from oxidative damage during hormone production.
Research in the Journal of Clinical Endocrinology and Metabolism found that selenium supplementation in Hashimoto’s patients significantly reduced thyroid peroxidase antibody levels, a direct marker of autoimmune thyroid attack, suggesting selenium has a protective effect on the thyroid beyond its role in hormone conversion.
Best dietary sources of selenium:
- Brazil nuts (the richest food source of selenium available; one to two Brazil nuts per day provides the full daily requirement of 55mcg; do not eat more than three to four daily as excess selenium is toxic)
- Yellowfin tuna
- Halibut
- Sardines
- Shrimp
- Salmon
- Chicken breast
- Eggs
- Brown rice
- Sunflower seeds
- Mushrooms (particularly shiitake and cremini)
- Whole wheat bread
Zinc-Rich Foods (Supports Thyroid Hormone Synthesis)
Zinc is required for the synthesis of thyroid-releasing hormone (TRH) in the hypothalamus, which initiates the entire thyroid hormone production cascade. Zinc deficiency impairs thyroid function and is associated with hypothyroid symptoms even when thyroid hormone levels appear adequate on blood tests. Research published in the Journal of the American College of Nutrition found that zinc supplementation improved thyroid hormone levels in zinc-deficient individuals with hypothyroidism.
Best dietary sources of zinc:
- Oysters (the single richest food source of zinc)
- Beef (lean cuts: sirloin, tenderloin)
- Chicken thighs and dark meat (higher zinc than breast)
- Crab and lobster
- Pumpkin seeds (pepitas; one of the richest plant sources)
- Hemp seeds
- Cashews
- Chickpeas
- Lentils
- Quinoa
- Oats
Iron-Rich Foods (Required for Thyroid Peroxidase Activity)
Thyroid peroxidase, the enzyme that incorporates iodine into thyroid hormones, is iron-dependent. Iron deficiency impairs thyroid hormone synthesis and is extremely common in people with hypothyroidism, particularly women. The American Thyroid Association notes that iron deficiency anemia worsens hypothyroid symptoms and can reduce the effectiveness of levothyroxine treatment.
Best dietary sources of iron:
- Lean red meat (sirloin, tenderloin; heme iron is more bioavailable than plant iron)
- Chicken liver (exceptionally iron-rich; eat once or twice per week)
- Oysters and clams
- Sardines
- Spinach (pair with vitamin C to enhance non-heme iron absorption)
- Lentils
- Chickpeas
- Kidney beans
- Pumpkin seeds
- Tofu
- Quinoa
- Dark chocolate (70% or higher)
- Fortified whole grain cereals
Iron absorption tip: Pair plant-based iron sources with a vitamin C-rich food (bell peppers, citrus, strawberries, broccoli) at the same meal to significantly increase non-heme iron absorption. Avoid coffee or tea with iron-rich meals as both inhibit absorption.
Anti-Inflammatory Foods (Critical for Hashimoto’s)
Hashimoto’s thyroiditis is driven by chronic autoimmune inflammation. Dietary inflammation amplifies this process; dietary anti-inflammatory foods help modulate it. Research in Autoimmunity Reviews found that anti-inflammatory dietary patterns were associated with reduced thyroid antibody levels and improved quality of life in Hashimoto’s patients.
Fatty fish (rich in omega-3s, the most anti-inflammatory macronutrient):
- Salmon (wild-caught)
- Mackerel
- Sardines
- Herring
- Anchovies
- Trout
Colorful vegetables and fruits (rich in antioxidants that reduce oxidative stress on the thyroid):
- Blueberries
- Strawberries
- Raspberries
- Cherries
- Red and purple grapes
- Pomegranate
- Bell peppers (all colors)
- Tomatoes
- Spinach
- Kale
- Sweet potatoes
- Beets
- Carrots
- Red cabbage
- Purple cabbage
Other anti-inflammatory staples:
- Extra virgin olive oil (oleocanthal has documented anti-inflammatory properties)
- Turmeric with black pepper (curcumin reduces inflammatory cytokines)
- Ginger (fresh or ground)
- Garlic
- Green tea
Lean Proteins (Support Metabolism and Muscle Preservation)
Hypothyroidism slows metabolism and makes weight gain easier and weight loss harder. Adequate protein intake preserves lean muscle mass, which is metabolically active tissue that partially counteracts the metabolic slowdown caused by low thyroid hormone. The Mayo Clinic recommends a nutrient-dense diet centered on lean proteins, vegetables, and whole grains for people managing hypothyroidism.
Best protein sources:
- Chicken breast (skinless)
- Turkey breast (skinless)
- Salmon and other fatty fish (protein plus omega-3s)
- Cod, tilapia, halibut
- Tuna (canned in water)
- Shrimp
- Eggs (whole; yolks contain iodine, selenium, and zinc)
- Plain Greek yogurt
- Plain cottage cheese
- Lean beef (sirloin, tenderloin; also provides zinc and iron)
- Lentils
- Chickpeas
- Quinoa
- Tempeh
Gut-Supporting Foods (Important for Hashimoto’s)
Intestinal permeability (leaky gut) is strongly associated with autoimmune thyroid disease. Research published in Best Practice and Research: Clinical Gastroenterology found that gut microbiome disruption and intestinal permeability are common in Hashimoto’s patients and may contribute to the autoimmune process by allowing partially digested proteins to enter the bloodstream and trigger immune responses.
Probiotic and fermented foods:
- Plain Greek yogurt with live active cultures
- Plain kefir (one of the most potent probiotic food sources)
- Sauerkraut (refrigerated, not shelf-stable)
- Kimchi (refrigerated)
- Miso paste (white or yellow)
- Tempeh
Prebiotic foods that feed beneficial gut bacteria:
- Garlic
- Onions and leeks
- Asparagus
- Bananas (slightly underripe)
- Oats
- Apples
- Jerusalem artichokes
- Flaxseeds
Whole Grains and Complex Carbohydrates
- Oats (rolled or steel-cut)
- Quinoa (complete protein and complex carbohydrate)
- Brown rice
- Farro
- Barley
- Buckwheat
- Sweet potatoes (rich in beta-carotene and gut-friendly fiber)
- White potatoes with skin (good source of potassium and resistant starch)
- 100% whole grain bread
Healthy Fats
- Extra virgin olive oil (primary cooking and dressing fat)
- Avocados (monounsaturated fat, fiber, and anti-inflammatory compounds)
- Walnuts (rich in omega-3 ALA; note: take at least 4 hours after levothyroxine)
- Almonds
- Chia seeds
- Ground flaxseeds (omega-3 ALA and fiber)
- Hemp seeds
- Pumpkin seeds (also rich in zinc)
- Natural almond or peanut butter
Foods to Limit or Avoid With Hypothyroidism
Goitrogenic Foods in Raw, Large Amounts
Goitrogens are naturally occurring compounds in certain foods that can interfere with thyroid hormone production by blocking iodine uptake. The foods most associated with goitrogenic activity are raw cruciferous vegetables. Cooking significantly reduces goitrogenic activity, typically by 30 to 90% depending on cooking method and duration.
Foods with goitrogenic potential:
- Raw kale in large daily quantities (such as large daily green smoothies with multiple cups of raw kale)
- Raw broccoli in large daily quantities
- Raw cauliflower
- Raw Brussels sprouts
- Raw cabbage
- Raw bok choy
- Raw turnips and rutabaga
- Millet (a grain with documented goitrogenic activity; limit if iodine intake is low)
The practical rule: Cooked cruciferous vegetables in normal meal-sized portions are not a meaningful concern for most people with hypothyroidism and should not be eliminated. They are highly nutritious and anti-inflammatory. The risk applies primarily to very large daily quantities of raw cruciferous vegetables, particularly in people who are already iodine-deficient. Steam, roast, or sauté your cruciferous vegetables and eat them freely.
Soy in Excessive Amounts
Soy isoflavones can inhibit thyroid peroxidase, the enzyme that incorporates iodine into thyroid hormones. Research published in Thyroid found that soy isoflavones may also interfere with levothyroxine absorption when consumed close to medication time. Moderate soy consumption in the form of edamame, tofu, or tempeh eaten several hours after medication is not a significant concern for most people. Large daily doses of soy protein isolate powder or soy supplements are more problematic.
Gluten (For Hashimoto’s Patients Specifically)
The relationship between gluten and Hashimoto’s is one of the most discussed topics in thyroid nutrition. The evidence is clearest for people with both Hashimoto’s and celiac disease or non-celiac gluten sensitivity, where gluten elimination reduces thyroid antibodies and improves symptoms. A study published in Gastroenterology found a significantly higher rate of undiagnosed celiac disease in people with autoimmune thyroid conditions compared to the general population.
For people with Hashimoto’s who do not have confirmed celiac disease or gluten sensitivity, the evidence for strict gluten elimination is less definitive. However, a 3 to 6 month trial of a gluten-free diet is often recommended by integrative medicine practitioners to assess individual response. If you choose to try it, eliminate gluten completely rather than partially, as partial elimination does not reduce intestinal permeability.
Ultra-Processed Foods
Ultra-processed foods promote systemic inflammation, disrupt the gut microbiome, and deliver excessive sodium, refined sugars, and industrial seed oils, all of which worsen the autoimmune activity underlying Hashimoto’s. Avoid packaged snack foods, fast food, processed meats, commercial baked goods, and sugary drinks as a baseline principle of a thyroid-supportive diet.
Excessive Alcohol
Alcohol has a directly toxic effect on thyroid tissue and suppresses thyroid hormone production. Research in Alcoholism: Clinical and Experimental Research found that chronic alcohol consumption reduces T3 and T4 levels and increases TSH, effectively worsening hypothyroid status. Limit alcohol strictly, particularly during periods of symptom flares.
Highly Processed Refined Sugars
Refined sugar promotes inflammation, disrupts gut microbiome diversity, and contributes to the metabolic dysfunction that hypothyroidism already makes more likely. Minimize added sugars, sweetened beverages, commercial pastries, candy, and other high-sugar processed foods.
For a closer look at symptoms and foods worth being mindful of, see our 10 foods to avoid for hypothyroidism, and if you’re wondering how thyroid function connects to the numbers on your labs, our guide to normal TSH levels in women breaks down what those results mean.
Hypothyroidism Grocery List by Store Section
This list covers one week of thyroid-supportive eating for one to two people.
Produce
Vegetables:
- Spinach (1 large bag)
- Kale (1 bunch; for cooked dishes)
- Mixed salad greens (1 bag)
- Broccoli (2 heads; steam or roast, not raw in large quantities)
- Cauliflower (1 head)
- Brussels sprouts (300g)
- Bell peppers (2 red, 1 yellow, 1 orange; rich in vitamin C for iron absorption)
- Cherry tomatoes (1 pint)
- Asparagus (1 bunch; prebiotic fiber)
- Mushrooms, cremini or shiitake (300g; selenium-rich)
- Carrots (500g)
- Sweet potatoes (4 medium)
- Beets (4 medium)
- Onions (1 bag; prebiotic)
- Leeks (2; prebiotic)
- Garlic (2 bulbs; anti-inflammatory and prebiotic)
- Zucchini (2 medium)
- Cucumber (2)
- Celery (1 bunch)
- Fresh ginger (1 large piece)
- Fresh turmeric (1 piece, optional; ground turmeric also fine)
- Avocados (4)
- Lemons (4; for vitamin C to boost iron absorption)
- Limes (2)
Fruits:
- Blueberries (1 pint fresh or 1 bag frozen)
- Strawberries (1 punnet)
- Raspberries (1 punnet)
- Cherries (1 bag fresh or frozen)
- Apples (4; prebiotic fiber)
- Pears (3)
- Oranges (4; vitamin C for iron absorption)
- Bananas (1 bunch; prebiotic when slightly underripe)
- Pomegranate seeds or juice (1 pack or bottle; unsweetened)
- Frozen mixed berries (1 large bag)
Proteins
- Salmon fillets, wild-caught (3 to 4 portions; selenium and omega-3s)
- Cod or halibut fillets (2 portions; iodine-rich)
- Shrimp, frozen no added sodium (1 bag; iodine and selenium)
- Tuna, canned in water no added salt (3 cans)
- Sardines, canned in water or olive oil (2 cans; selenium-rich)
- Chicken breasts, skinless (600g)
- Chicken thighs, skinless (400g; higher zinc than breast)
- Lean beef sirloin or tenderloin (400g; zinc and iron; limit to twice weekly)
- Eggs (2 dozen; iodine, selenium, zinc)
- Plain Greek yogurt (900g tub; probiotic and iodine)
- Plain kefir (500ml; probiotic)
- Plain cottage cheese, low-sodium (500g)
- Lentils, dried green or red (1 lb bag; iron and zinc)
- Canned chickpeas, low-sodium (2 cans; zinc and iron)
- Quinoa (500g; zinc and complete protein)
- Firm tofu (1 to 2 blocks; eat several hours after medication)
Nuts and Seeds
- Brazil nuts (1 small bag; eat 1 to 2 daily for selenium; do not overeat)
- Pumpkin seeds, pepitas (200g; richest plant source of zinc)
- Hemp seeds (150g; zinc)
- Sunflower seeds (150g; selenium)
- Walnuts (150g; omega-3 ALA; take at least 4 hours after levothyroxine)
- Almonds (150g)
- Chia seeds (200g)
- Ground flaxseeds (200g; omega-3 and prebiotic fiber)
- Natural almond butter (1 jar)
- Natural peanut butter, no added sugar (1 jar)
- Tahini (1 jar)
Grains
- Rolled oats (large container; zinc and prebiotic fiber)
- Brown rice (1 kg; selenium)
- Farro or barley (1 bag)
- Buckwheat (1 bag)
- 100% whole grain bread (label check: whole wheat flour, water, yeast, salt)
- Whole wheat pasta (500g)
Dairy and Alternatives
- Low-fat milk or unsweetened soy milk (1 liter; iodine; note timing with medication for soy)
- Unsweetened almond milk (1 carton)
- Plain kefir (listed also under proteins)
- Hard cheese, parmesan or cheddar (small block; iodine)
Pantry
- Iodized salt (use this rather than non-iodized sea salt or Himalayan salt for cooking)
- Extra virgin olive oil (1 bottle; anti-inflammatory)
- Apple cider vinegar (1 bottle)
- Low-sodium soy sauce or tamari (use after medication timing window)
- Miso paste, white or yellow (1 container; probiotic and gut-supportive)
- Canned diced tomatoes, no added salt (3 cans)
- Low-sodium chicken or vegetable broth (2 cartons)
- Canned salmon in water (2 cans; selenium)
- Dark chocolate 70% or higher (1 to 2 bars; iron and antioxidants)
- Ground turmeric (1 jar)
- Ground ginger (1 jar)
- Black pepper (pairs with turmeric for absorption)
- Cinnamon (1 jar; blood sugar support)
- Garlic powder and onion powder
- Cumin, smoked paprika, oregano
Fermented Foods
- Refrigerated sauerkraut (1 jar; live cultures)
- Refrigerated kimchi (1 jar)
- Plain kefir (listed above)
- Plain Greek yogurt with live cultures (listed above)
Frozen
- Frozen wild-caught salmon portions (1 bag)
- Frozen broccoli (2 bags)
- Frozen spinach (1 bag)
- Frozen mixed berries (1 large bag)
- Frozen shelled edamame (1 bag; moderate amounts, several hours after medication)
- Frozen cherries (1 bag)
Beverages
- Water (8 or more cups daily)
- Green tea (unsweetened; anti-inflammatory; do not drink within 1 hour of levothyroxine)
- Ginger tea (anti-inflammatory)
- Turmeric golden milk (unsweetened plant milk with turmeric, black pepper, and cinnamon)
- Coffee (after the medication absorption window; black or with minimal additions)
- Herbal teas
Key Nutrients to Track With Hypothyroidism
| Nutrient | Role in Thyroid Function | Best Food Sources |
|—|—|—|
| Iodine | Raw material for T3 and T4 production | Iodized salt, seafood, dairy, eggs |
| Selenium | T4 to T3 conversion; thyroid protection | Brazil nuts, seafood, eggs, sunflower seeds |
| Zinc | Thyroid hormone synthesis; TRH production | Oysters, beef, pumpkin seeds, lentils |
| Iron | Thyroid peroxidase activity | Red meat, lentils, spinach, sardines |
| Omega-3 fatty acids | Reduces autoimmune inflammation | Salmon, sardines, mackerel, walnuts, flaxseeds |
| Vitamin D | Immune regulation; low in most Hashimoto’s patients | Fatty fish, eggs, fortified dairy; usually requires supplementation |
| Magnesium | Supports thyroid hormone receptor sensitivity | Spinach, almonds, pumpkin seeds, dark chocolate |
| Vitamin B12 | Often deficient in hypothyroidism; supports energy and nervous system | Salmon, eggs, Greek yogurt, beef |
Note on vitamin D: Vitamin D deficiency is extremely common in people with Hashimoto’s and autoimmune thyroid disease generally. Research in Thyroid found a significant inverse relationship between vitamin D levels and thyroid antibody levels. Food sources of vitamin D are limited; most people with hypothyroidism benefit from a vitamin D3 supplement of 1,000 to 2,000 IU daily, but check your blood levels with your doctor first.
Practical Tips for Eating With Hypothyroidism
Take levothyroxine correctly. No dietary change matters as much as taking your medication properly. Take it on an empty stomach with a full glass of water, wait 30 to 60 minutes before eating or drinking anything other than water, and keep coffee, calcium-rich foods, and iron supplements at least four hours away from your dose.
Eat one to two Brazil nuts daily, not more. Brazil nuts are the single most efficient way to meet your selenium needs through food. One nut provides approximately 70 to 90mcg of selenium; the daily requirement is 55mcg. Eating a large handful regularly can cause selenium toxicity. One to two nuts per day is the sweet spot.
Cook your cruciferous vegetables. Steaming, roasting, or sautéing broccoli, kale, cauliflower, and Brussels sprouts reduces their goitrogenic compounds by 30 to 90% while preserving most of their nutritional value. There is no need to eliminate these highly nutritious vegetables from your diet.
Prioritize omega-3 fatty acids. Eating fatty fish three or more times per week is one of the most impactful dietary changes for Hashimoto’s patients because omega-3s directly reduce the inflammatory cytokines that drive autoimmune thyroid destruction.
Consider a 3-month gluten-free trial if you have Hashimoto’s. Testing for celiac disease before eliminating gluten gives you useful information. If celiac disease is ruled out but you still suspect gluten sensitivity, a strict 3-month elimination followed by a controlled reintroduction is the most practical way to determine whether gluten affects your thyroid antibody levels or symptoms.
Support your gut daily. Include at least one probiotic food (Greek yogurt, kefir, sauerkraut, kimchi, or miso) and one prebiotic food (garlic, onions, oats, bananas, or asparagus) every day. Gut health is not peripheral to thyroid health in Hashimoto’s; it is central to it.
The Bottom Line
A hypothyroidism diet grocery list centers on foods that provide the nutrients the thyroid needs most: iodine for hormone production, selenium for T4 to T3 conversion, zinc and iron for hormone synthesis, and omega-3 fatty acids to reduce the autoimmune inflammation that drives Hashimoto’s. Stock your kitchen with fatty fish, eggs, lean meats, colorful vegetables, whole grains, fermented foods, pumpkin seeds, and a small daily dose of Brazil nuts, and use iodized salt in cooking. Limit raw cruciferous vegetables in very large amounts, time soy foods away from your medication, reduce ultra-processed foods and refined sugars, and minimize alcohol. If you take levothyroxine, getting the timing of your medication right is as important as anything on this grocery list. Use the list above as your weekly shopping foundation, eat to support your thyroid consistently rather than perfectly, and work with your doctor on regular thyroid panel monitoring to track how your dietary changes complement your medical treatment.
Disclaimer: Nutritional data referenced in this article is sourced from USDA FoodData Central. This article is for informational purposes only and does not constitute medical or dietary advice. Hypothyroidism is a medical condition requiring professional diagnosis and treatment. Always consult your endocrinologist, physician, or registered dietitian before making significant dietary changes, particularly if you take thyroid medication.
