When I received my diagnosis, the first question I asked my endocrinologist was simple: okay, so what should I eat now? The answer I got was probably the same one you received: "Eat normally, just take your medication regularly."
That answer isn't wrong, but it is incomplete. Diet won't eliminate Hashimoto's and it won't replace levothyroxine, but it can dampen the autoimmune process, change how tired you feel when you wake up, how much your stomach bloats after a meal, whether your hair is falling out, and how stable your energy levels are throughout the day. For me, the difference was huge, which is why I'm writing this.
Below is the framework I follow: the foods, the nutrients I track, what to cut out, and—just as importantly—what to bring back in.
Hashimoto's thyroiditis is an autoimmune condition in which the immune system attacks thyroid tissue, releasing pro-inflammatory cytokines.15 Medication regulates hormone levels, but it doesn't address three things that diet directly influences:
Diet doesn't cure, but it heals and creates the conditions where your medication works as it should and where you feel better.
This is the change that helped me the most. Protein stabilizes blood sugar, maintains muscle mass (which is the first thing to suffer with a slow metabolism), and provides lasting satiety. Eggs, fish, chicken, turkey, beef, lamb, lentils (if they don't bother you), and chickpeas.
Fiber feeds the gut microbiome, and in autoimmune thyroid diseases, the composition of the microbiome is directly linked to the immune response.13 I try to make vegetables the main part of my plate, in a variety of colors throughout the week, rather than just a small side salad.
Olive oil, avocado, nuts, seeds, and fatty fish. Hormones are made from fats, and omega-3 fatty acids help regulate the inflammatory response.
There is no reason for a woman with Hashimoto's to cut out carbohydrates entirely. It makes sense to choose those that provide fiber and minerals along with energy: sweet potatoes, buckwheat, millet, brown rice, legumes, and fruit. White potatoes aren't forbidden, but I eat them with protein and fat, not on their own.
Long-term, an overly low carbohydrate intake can further slow down the conversion of T4 to T3.
Skipping meals and "making up for it" in the evening leads to poor sleep and morning fatigue. For me, it was more valuable to have three meals that I actually ate than a perfect plan that I could only stick to for four days.
This is the part that causes the most confusion, so I will be precise.
The autoimmune protocol is an elimination diet developed for autoimmune diseases. During the elimination phase, you remove gluten, all grains, dairy products, legumes, soy, eggs, nuts and seeds, nightshades (tomatoes, peppers, eggplant, potatoes), refined sugars, alcohol, and industrial additives.
According to AIP, therefore, almost all the controversial foods mentioned in this text are removed - and they are removed completely.
But what is most often left unsaid is that AIP was never intended to be a permanent dietIt has two phases: elimination, followed by structured reintroduction. The second phase is just as essential a part of the protocol as the first.
To date, one pilot study has been published that tested AIP specifically on women with Hashimoto's. Seventeen women completed a ten-week program with phased elimination.1
Results: a significant decrease in symptom burden and a drop in inflammatory markers (hs-CRP), along with a marked improvement in quality of life. But - and this is key - no statistically significant change was recorded in antibody levels or thyroid function1. The study was small, lacked a control group, and included a coaching program, so the effect of the diet alone cannot be isolated.
In other words: there is good reason to believe you will feel better. There is no evidence that restriction will stop the autoimmune process.
This is a mistake almost every woman I have spoken to has made, myself included. You cut out ten things, feel better, and then stay on those ten restrictions for years, afraid to reintroduce anything. The problem is as follows:
The only exception is celiac disease. If the test is positive, gluten is not reintroduced—in that case, a gluten-free diet is a lifelong therapy, not an experiment. I don't have celiac disease, but my stomach is hypersensitive to gluten. Every bite causes problems for the next 3 days. Based on my experience, I would never bring it back. Again, it's individual.
If you're choosing where to start, gluten is the food with the strongest arguments. Here they are in order.
Hashimoto's and celiac disease share the same genetic background—HLA-DQ2 and HLA-DQ8 variants—which is why they often occur together.14 That is why testing is done before eliminating gluten. If it turns out you have it, it changes everything: in undiagnosed celiac disease, an increased need for levothyroxine dosage has been reported, as the medication is absorbed less effectively through the damaged intestinal lining.
Gliadin, a protein found in gluten, is structurally similar to tissue transglutaminase and proteins in the thyroid gland.14 The immune system, having learned to attack gliadin, can use the same mechanism to strike the thyroid gland itself. This is a mechanism described in the literature, but to be fair: a described mechanism is not the same as a clinically proven effect in every woman.
Gliadin stimulates the release of zonulin, a protein that regulates the tight junctions between the cells of the intestinal wall. More zonulin means looser junctions and greater passage of molecules into the bloodstream—a mechanism considered one of the prerequisites for the development of autoimmune diseases.12
In women with Hashimoto's without celiac disease, a pilot study on women who were not yet on therapy showed that a gluten-free diet led to a decrease in antibody titers.2 The study is small, and for that reason, official endocrinology guidelines for treating hypothyroidism do not list a gluten-free diet as part of the therapy if celiac disease is not present.10
My position: Gluten is the first thing I cut out for 6 to 12 weeks, with blood work done before and after. If there is a visible difference, it stays out. If there is no change, there is no reason to treat it as a lifelong ban.
Under the autoimmune protocol, dairy is removed during the elimination phase. The arguments for this are weaker than for gluten, so it is worth evaluating them separately.
The most strongly supported issue is lactose intolerance: it is common in those with autoimmune diseases and is linked to an increased need for levothyroxine dosage, likely due to impaired absorption.18 That is a concrete, measurable reason to at least separate dairy consumption from your medication.
Claims often heard that lack solid evidence include: that casein is structurally similar to gluten and causes cross-reactivity, that whey promotes mucus production, and that estrogen in milk disrupts thyroid hormone metabolism. These are hypotheses from functional medicine, not established science, and I treat them as such.
My approach: Dairy goes through elimination and reintroduction just like everything else. For some women, bloating, acne, and lethargy disappear, and dairy stays out. For others, there is no difference, so it is reintroduced—usually starting with fermented dairy, as it is easier to digest.
There is little debate about this. Women with Hashimoto's feel the sharp spikes and crashes in blood sugar more intensely than anyone, and chronic hyperinsulinemia and inflammation go hand in hand. This is the only restriction I do not include in reintroduction. I believe it causes too much harm to healthy people, let alone those of us with Hashimoto's.
Iodine is essential for the thyroid gland, but in cases of autoimmune thyroiditis both excess and deficiency can worsen the condition11,14. This means: no taking iodine supplements on your own and be cautious with seaweed (kelp, nori, dulse) and seaweed-based products.
However, do not cut out iodized salt. In Serbia, salt iodization is mandatory and serves as the primary protection for the population against iodine deficiency. The advice to avoid it, which you will find on the English-speaking internet, creates the opposite problem here to the one you are trying to solve.
Soy can interfere with the absorption of levothyroxine.16,9 It does not need to be eliminated by everyone, but definitely do not eat it in the same meal as your medication. Fermented soy (tempeh, miso) is generally tolerated better than processed soy.
It disrupts sleep, puts a strain on the liver where part of the hormone conversion takes place, and it reliably brought back my bloating. You don't have to cut it out completely, but pay attention to how you feel the next day.
This is the part I wish someone had explained to me at the beginning. Don't take supplements blindly: get blood work done and only supplement what is actually low.
If this is too much for you to put together into a weekly plan on your own - that is exactly why I created The Hashimoto Cookbook: recipes, meal plans, a guide to supplementation, and a protocol for flare-ups, all in one place. Join the waiting list here.
This part is most often overlooked. Levothyroxine is absorbed inconsistently and is easily affected by food.
Broccoli, cauliflower, kale, and cabbage contain goitrogens, which is why half the internet tells women with Hashimoto's to avoid them. The reality: for goitrogens to have any clinical significance, you would need to eat them in massive quantities, raw, while simultaneously suffering from an iodine deficiency.11 Cooking them reduces them even further.
By cutting out that entire group of vegetables, you lose fiber and micronutrients you need, while gaining very little. By the way: spinach is not a goitrogen - it often appears on those lists, but it does not belong to the cruciferous family.
This is roughly what my daily structure looks like:
I am not counting or measuring anything at the moment, and I try not to set rules that I cannot maintain during weeks when I am working and training.
* Do not cut calories too much. 1200 kcal is the bare minimum an adult needs just for brain function.
There are weeks when everything is harder: the fatigue is deeper, your stomach is acting up, and nothing is going as it should. That is when I simplify instead of adding new rules:
A flare-up is a period you get through, and it usually has nothing to do with something you ate. If it lasts longer than a few weeks, that is a reason to check your lab results, not to start a new restriction.
And one more thing, honestly: if you notice that food is becoming a source of constant anxiety, that your list of forbidden foods is growing, and that you are avoiding social situations because of eating—that is a sign that you need support from a nutrition expert or a psychotherapist, not another protocol.
The hardest part of all this is implementation. Knowing what you should eat and having a plan ready for a Monday night when you have no energy are two different things.
That is why I wrote The Hashimoto Cookbook - recipes tailored for Hashimoto's, a weekly meal plan, a guide to supplementation, and a protocol for flare-ups. Everything I spent years putting together myself, all in one place and in Serbian.
Join the waiting list and be the first to know when the Cookbook is released →
Note: This text is based on my personal experience and the cited literature and is not intended as medical advice. Always consult your endocrinologist for diagnosis, treatment, and dosage adjustments.
