Hashimoto's Diet: What the Evidence Actually Says

No diet has been shown to treat Hashimoto's. The research on the named diets, from Mediterranean to the autoimmune protocol (AIP), is small, short and early, and none has reliably lowered thyroid antibodies or TSH. A Mediterranean-style way of eating is the most sensible fit and matches the Australian Dietary Guidelines. Cut gluten only if you have coeliac disease, cut lactose only if you are intolerant, and be wary of anyone promising a diet that puts Hashimoto's into remission.

People with Hashimoto's are often told to try a particular diet, usually with great confidence. Here is what the trials actually show for each of the popular ones, and what a sensible week of eating looks like instead.

The big picture

The only systematic review of diet trials in Hashimoto's, published in 2023, found nine small studies that each tested something different, and called for better research before any recommendation can be made. A 2022 review in a journal of the US Endocrine Society found that many of the most popular approaches have no proven benefit or have not been well studied. The British and Australian thyroid foundations say much the same.

One thing to keep in mind when reading diet claims online: antibody levels rise and fall on their own, and often drift down over time on levothyroxine. In one long-term study of people with Hashimoto's on levothyroxine, antibodies fell gradually without any diet change. So a lower number after a diet is not proof the diet worked. Our guide to thyroid antibodies explains what they do and don't mean.

Mediterranean diet

This has the most support, though it is still thin. An Italian study found people with Hashimoto's who ate more Mediterranean-style had lower markers of oxidative stress. Two small trials since, of 45 and 40 people, found improvements in some of those markers but no change in thyroid antibodies or TSH. It is a sensible, flexible way to eat, built around vegetables, legumes, wholegrains, fish, olive oil and nuts, and it lines up with the Australian Dietary Guidelines. Just don't expect it to change your test results.

"Anti-inflammatory" diet

This is a description rather than a tested treatment. No trial has compared an anti-inflammatory diet with a normal diet in Hashimoto's. In practice it overlaps heavily with Mediterranean eating, so the same honest summary applies.

Autoimmune protocol (AIP)

AIP removes grains, legumes, dairy, eggs, nuts, seeds, nightshades and more, then slowly reintroduces them. In a 2019 study of 16 people with no comparison group, participants reported feeling better, but their thyroid antibodies didn't change, and one of the authors ran the coaching program being tested. In a 2023 study of 28 people, also with no comparison group, antibodies went up. AIP is very restrictive and cuts several of Australia's main iodine sources, like bread, dairy and eggs. Anyone keen to try it should do so with a dietitian.

Gluten-free

Coeliac disease is more common with Hashimoto's, and if you have it, going gluten-free matters. If you don't, a 2025 review of the randomised trials found no clear benefit for antibodies or thyroid function from cutting gluten. Get tested before you cut it, because cutting it first can hide the result. Our guide to gluten-free for Hashimoto's goes into detail.

Dairy-free and lactose

Lactose intolerance can affect how well levothyroxine is absorbed. In one small study, people with Hashimoto's and lactose intolerance had lower TSH after cutting lactose, likely because their tablet was absorbed better. But an Italian study found lactose intolerance was no more common in Hashimoto's than in anyone else, and for people without it, going lactose-free didn't change TSH or dose. If dairy upsets your stomach, or your dose keeps rising, ask about testing for lactose intolerance. Lactose-free dairy keeps the calcium and iodine that cutting dairy entirely would lose.

Low-carb and keto

There are no human trials of a keto diet in Hashimoto's. The low-carb studies that exist are short and small, and the best known was not randomised and also cut many other foods at once, so it is impossible to say what made any difference.

Paleo, vegan and plant-based

There are no Hashimoto's trials of paleo eating. For plant-based diets, a large North American study found vegan diets were not linked with a higher risk of an underactive thyroid. The real watch-out on a vegan diet is iodine: a 2023 review found vegans often have lower iodine intakes, and most plant milks don't contain it. If you eat plant-based, make sure you still get iodine from bread made with iodised salt, and ask your doctor before taking any iodine supplement.

Intermittent fasting

No Hashimoto's trial of fasting was found. The main thing to protect is your tablet routine. If you fast or change your meal times, keep taking your tablet with water, 30 to 60 minutes before food, and ask for your levels to be checked if your routine changes a lot.

Sugar

There is no Hashimoto's-specific research on sugar. The general Australian advice to limit added sugars, like soft drinks, lollies and cordials, applies to everyone.

Weight-loss diets and food intolerance tests

Losing excess weight steadily is worth doing for its own sake. Be wary of diets built on IgG food intolerance tests: the Australasian Society of Clinical Immunology and Allergy lists them among tests it does not recommend, warning they can lead to misdiagnosis and unnecessary food restrictions. Our guide to weight and an underactive thyroid covers what does help.

Iodine and kelp

With Hashimoto's, avoid extra iodine from tablets, kelp and seaweed supplements unless your doctor recommends them. But you don't need to cut bread or iodised salt. Our guide to iodine, kelp and your thyroid explains the balance.

A sensible week of eating

There is no proven Hashimoto's meal plan, so "7-day plans" are someone's suggestion rather than research. A better guide is the Australian Dietary Guidelines' five food groups. Most adults aged 19 to 50 need about 5 to 6 serves of vegetables and legumes, 2 of fruit, about 6 of grain foods (mostly wholegrain), 2 and a half to 3 of protein foods, and 2 and a half of dairy or alternatives each day. A week built that way might include:

• Breakfasts (30 to 60 minutes after your tablet): porridge with fruit and yoghurt, eggs on wholegrain toast, or Greek yoghurt with nuts and berries.
• Lunches: lentil and vegetable soup, a tuna and bean salad, or a wholegrain wrap with chicken and salad.
• Dinners: baked salmon with roast vegetables, a chickpea curry with rice, or a stir-fry with tofu or lean beef and plenty of vegetables, cooked broccoli included.
• Snacks: fruit, a handful of nuts, cheese and wholegrain crackers.

Our guide to the underactive thyroid diet covers soy, broccoli and timing in more detail.

Where ThyroBase fits

No food, diet or powder treats Hashimoto's. ThyroBase is a daily morning and evening nutrition powder, a food rather than a medicine, that adds plant protein, greens and minerals to your day, with no added iodine. It sits alongside your thyroid medication, never instead of it, and isn't designed around any particular diet. Both serves contain minerals, so keep them several hours away from your tablet. Here is who ThyroBase is, and is not, designed for.

No diet has been shown to treat Hashimoto's. Eat well, test before you cut, and judge any diet by how you live, not by one antibody result.

Frequently asked questions

What is the best diet for Hashimoto's?

No diet has been shown to treat Hashimoto's. A Mediterranean-style way of eating has the most support and matches the Australian Dietary Guidelines, but small trials found it didn't change antibodies or TSH. Cut gluten only with coeliac disease, and lactose only with diagnosed intolerance.

Does the AIP diet work for Hashimoto's?

Two small studies with no comparison group found people felt better on AIP, but antibodies didn't fall in one and rose in the other. AIP is very restrictive and cuts key iodine foods like bread, dairy and eggs, so if you try it, do it with a dietitian.

Should I go dairy-free with Hashimoto's?

Only if you are lactose intolerant. In intolerant people, cutting lactose can improve how well levothyroxine is absorbed. For everyone else it hasn't been shown to help. Lactose-free dairy keeps the calcium and iodine that cutting dairy completely would lose.

Can diet lower thyroid antibodies?

No diet has reliably lowered thyroid antibodies in trials. Antibody levels also rise and fall on their own and often drift down on levothyroxine, so a lower result after a diet change isn't proof the diet worked.

Is there a 7-day meal plan for Hashimoto's?

No meal plan has been tested in research. A sensible week follows the Australian Dietary Guidelines: plenty of vegetables and legumes, fruit, wholegrains, protein foods and dairy or alternatives, with breakfast 30 to 60 minutes after your thyroid tablet.

The honest takeaway

With Hashimoto's, the evidence doesn't support a special diet. Eat in a Mediterranean-style way that you can keep up, get tested before cutting gluten or dairy, avoid extra iodine supplements, and be cautious of any plan that promises to lower your antibodies or reverse the condition. Your thyroid tablet, taken consistently, is still what keeps your levels right.

ThyroBase is a nutritional supplement and is not intended to diagnose, treat, cure, or prevent any disease. It is designed to sit alongside your thyroid medication, not replace it. This article is general information, not medical advice. Never start, stop or change a supplement or prescription medication without speaking to your doctor or pharmacist first.

References

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