Hypothyroidism Diet: What to Eat and What to Limit

A hypothyroidism diet is a balanced way of eating that supports your thyroid treatment rather than replacing it. It means getting enough (but not too much) iodine, eating foods that provide selenium and zinc, timing your levothyroxine away from food and certain supplements, and choosing fibre and protein to help with tiredness, weight and constipation.

There is a lot of confusing advice online about “thyroid diets”, with long lists of banned foods. In reality, most people with an underactive thyroid can enjoy a normal, varied diet. This guide explains what really matters, what to limit, and how to fit it around everyday South Asian and Middle Eastern meals.

What is an underactive thyroid?

Your thyroid is a small, butterfly-shaped gland at the front of your neck. It makes hormones that control how quickly your body uses energy, a process often called your metabolism. When the thyroid does not make enough of these hormones, it is called hypothyroidism or an underactive thyroid.

Everything can slow down a little. Common symptoms include:

• Tiredness and low energy
• Feeling cold more easily than others
• Some weight gain
• Constipation
• Dry skin and hair, or hair thinning
• Low mood, poor concentration or memory
• Muscle aches and changes to periods

A common cause is Hashimoto’s thyroiditis, an autoimmune condition where the immune system attacks the thyroid. Worldwide, not getting enough iodine is another important cause. Hypothyroidism is diagnosed with a blood test (usually TSH and thyroid hormone levels) arranged by your doctor.

Medication comes first: diet supports, it does not replace

The main treatment for an underactive thyroid is a daily hormone tablet called levothyroxine, prescribed by your doctor. It replaces the hormone your thyroid cannot make. No food, herb or supplement can do the same job, so never stop or change your dose without medical advice.

What you eat and drink can, however, affect how well your tablet is absorbed. Small habits make a big difference:

• Take it on an empty stomach, usually with water, at the same time each day. Many people take it first thing in the morning.
• Wait before breakfast and coffee – usually around 30–60 minutes. Coffee and soy foods can reduce absorption if taken too close to your dose.
• Separate it from calcium and iron supplements (and some indigestion remedies). These are usually taken several hours apart from levothyroxine.
• Be consistent – if you change your routine, such as during Ramadan, ask your doctor or pharmacist how to time your tablet.

Always follow the exact instructions from your pharmacist or doctor, as advice can vary for different people and products. Also tell your doctor if you take biotin supplements, because high-dose biotin can interfere with thyroid blood test results.

Thyroid diet basics: iodine, selenium and zinc

Iodine: enough, but not too much

Your thyroid needs iodine to make its hormones. In many countries, using iodised salt is the main way people get enough. However, more is not better: too much iodine can also upset thyroid function, especially in people with autoimmune thyroid disease.

• Use iodised salt, but in moderation, as eating a lot of salt is not good for your blood pressure.
• Fish, seafood, eggs, milk and yoghurt also provide iodine.
• Avoid kelp, seaweed tablets and iodine supplements unless your doctor specifically advises them, as they can contain very large and variable amounts.

Selenium and zinc from food

Selenium and zinc are involved in making and using thyroid hormones. The best approach is to get them from a varied diet rather than supplements, unless your doctor finds you are low.

Foods for an underactive thyroid: what to eat and what to limit

Do I need to avoid cabbage and broccoli?

Vegetables such as cabbage, broccoli, cauliflower and kale contain natural substances called goitrogens. You may have read that these harm the thyroid, but eating them cooked and in normal amounts is fine for most people. They are full of fibre, vitamins and minerals, so there is no need to cut them out. Just avoid eating very large raw amounts every day, for example in daily juices.

What about soy?

Soy foods such as tofu and soy milk are fine as part of a balanced diet. The main point is to keep them away from the time you take your levothyroxine and keep your intake fairly consistent, so your dose can be adjusted correctly.

Is a gluten-free diet good for Hashimoto’s?

There is no need to go gluten-free unless you have been diagnosed with coeliac disease. However, coeliac disease is more common in people with autoimmune thyroid disease. If you have symptoms such as bloating, diarrhoea, weight loss or low iron, ask your doctor about testing before you cut out gluten, because removing it first can affect the result. Learn more in our guide to coeliac disease.

Foods to limit

• Highly processed foods, fried snacks and sweets, which add calories without much nutrition
• Very salty foods, even when the salt is iodised
• Sugary drinks and large amounts of sweet chai
• Kelp, seaweed supplements and “thyroid support” products sold online

Managing weight, fatigue and constipation

An untreated underactive thyroid can lead to some weight gain, often partly from fluid. Once your thyroid levels are well controlled, weight is managed in the same way as for anyone else: a balanced plate, regular activity, good sleep and sensible portions. Our guide to sustainable weight loss shares practical strategies.

Some people with hypothyroidism also have insulin resistance, which can make weight harder to manage. If that applies to you, read our insulin resistance diet guide.

• Build a balanced plate: half vegetables or salad, a quarter protein (fish, chicken, eggs, dal, chickpeas) and a quarter wholegrain carbs (brown rice, wholemeal roti, oats).
• Include protein at each meal to help you feel full and keep energy steadier.
• Increase fibre gradually with vegetables, fruit, pulses and wholegrains, and drink plenty of water to ease constipation. See our guide to dietary fibre.
• Keep moving – regular walking can help with energy, mood and bowel habits.

A very high-fibre meal right next to your tablet may affect absorption, so keep your timing consistent and let your doctor know if you make big changes to your diet.

A sample day on a hypothyroidism diet

This is an example to give you ideas, not a strict plan.

• On waking: Levothyroxine with a glass of water. Wait as advised before eating.
• Breakfast: Oats cooked with milk, topped with berries and a few pumpkin seeds, or a vegetable omelette with a wholemeal chapati. Coffee or chai afterwards.
• Mid-morning: A piece of fruit and 1–2 Brazil nuts.
• Lunch: Grilled fish or chicken with brown rice, cooked mixed vegetables and a fattoush or kachumber salad.
• Snack: Hummus with cucumber and carrot sticks, or a bowl of yoghurt.
• Dinner: Dal or chana with cooked cabbage or cauliflower sabzi, a roti and a side of laban.

When to see a doctor

Contact your doctor if:

• You still have symptoms despite taking your treatment regularly
• You are pregnant or planning a pregnancy – thyroid levels need closer monitoring, and your dose may need adjusting early on
• You notice a new lump or swelling in your neck, or difficulty swallowing
• You have symptoms of too much thyroid hormone, such as a racing heart, shakiness or weight loss, after a dose change
• You start or stop supplements, or make big changes to your diet

Frequently asked questions

What foods should I avoid with hypothyroidism?

There are very few foods you need to avoid completely. Limit kelp, seaweed and iodine supplements unless advised, and keep coffee, soy, and calcium or iron supplements away from the time you take your tablet. Otherwise, focus on a balanced diet.

Can diet cure an underactive thyroid?

No. Diet cannot cure hypothyroidism or replace levothyroxine. A healthy diet can help you feel better, manage your weight and support your overall health alongside the treatment your doctor prescribes.

Can I eat rice and roti with hypothyroidism?

Yes. Rice and roti can be part of a healthy thyroid diet. Choose wholegrain versions where possible, keep portions moderate, and pair them with plenty of vegetables and a source of protein.

Should I take selenium supplements for Hashimoto’s?

Only take selenium supplements if your doctor advises them. Too much selenium can be harmful, and most people can get enough from foods such as fish, eggs, lentils and one or two Brazil nuts.

Get personalised nutrition support

Living with an underactive thyroid can be frustrating, especially when tiredness and weight changes affect your daily life. Dr. Rida Saeed can help you create a realistic eating plan that works alongside your medical treatment and suits your culture, routine and tastes. Consultations are online, so you can join from the UAE, Pakistan or anywhere in the world. Learn more about our hormone imbalance nutrition service or book on WhatsApp +971 54 448 6145.

This article is for general information only and is not a substitute for medical advice. Please speak to your doctor or a qualified health professional about your individual needs.