7 Foods That Are Making Your Thyroid Sick (2024)

Of the over 20million Americans suffering from thyroid disease, I’m sure most don’t think about their thyroid at the supermarket or their favorite restaurant…

Yet those are EXACTLY the places where, I daresay, thyroid health is most vulnerable.

Because within your beloved comfort food crackers or favorite restaurant salad dressing lurk the very foods making your thyroid sick.

If you already know about your thyroid problem, or if you’re already aware that thyroid disease runs in your family, has your doctor discussed diet with you at all? Unfortunately, allopathic and conventional medicine is typically content to throw pills at symptoms — rather than peeling back the layers to treat the heart of the problem.

Of these 7 foods that are making your thyroid sick, a few are found on this list as well: 5 Foods That Are Compromising Your Immune System. And it’s no wonder! Thyroid disease is almost always autoimmune in nature.

Remember…

Every cell in the body depends on thyroid hormones for regulation of their metabolism.

So if your thyroid is sick, your entire body will suffer.

7 Foods That Are Making Your Thyroid Sick

Nourishing your thyroid is a wonderful first step; however, you must also avoid the foods that make your thyroid worse. As you add foods that nourish the thyroid into your life, removethese foods too.

Food #1 — Soy

Years ago, Americans were urged away from tropical oils like coconut and palm oils and encouraged to begin using soy. It was touted as a health food — a perfect protein that could take the place of meat — and caused a rise in unhealthy vegetarian and vegan soy-based diets.

As a result, the soy movement began. And as is ever the case, money was behind it. Coconut palm trees simply don’t grow easily in the United States, so financial incentives were provided to soybean growers.

Soybean oil, texturized vegetable protein, tofu, margarine, shortening, soy milk, and cheap soy sauce flooded the market. Then, much to the demise of thyroids nationwide, saturated fats were demonized. Low-fat/unsaturated fat products and propaganda prevailed for several decades.

Their [polyunsaturated oils] best understood effect is their interference with the function of the thyroid gland. Unsaturated oils block thyroid hormone secretion, its movement in the circulatory system, and the response of tissues to the hormone. When the thyroid hormone is deficient, the body is generally exposed to increased levels of estrogen. The thyroid hormone is essential for making the ‘protective hormones’ progesterone and pregnenolone, so these hormones are lowered when anything interferes with the function of the thyroid. The thyroid hormone is required for using and eliminating cholesterol, so cholesterol is likely to be raised by anything that blocks the thyroid function. — Dr. Ray Peat (Source.)

Is Soy Still Around Today?

Absolutely. From restaurant food to breakfast cereal to bottled salad dressings to bread, it’s in everything. Look in protein bars, children’s snack foods, infant formula, mayonnaise, hummus, and potato chips — it’s there too.

Perhaps most disgustingly, soy is still proclaimed a healthy protein source. Upon walking into almost any health food store, one can find soy masquerading as chicken, cheese, sausage, and hot dogs.

Infants suffer from autoimmune thyroid disorders, leaky gut syndrome, and liver and kidney problems when they eat solely soy-based formula (source).

Soy can adversely affect thyroid hormone production as well as interfere with the uptake of synthetic thyroid hormones. Not to mention, almost all soy on the market nowadays is genetically modified, so it’s not even good for those with optimum thyroid function.

Like sugar, soy hides in places you’d never expect. For this reason, we always encourage you to make your own salad dressings and condiments, mayo, and other foods that contain soy when purchased from the store.

Action Step: Diligently read labels on every pre-made food you purchase. Place it back on the shelf if it contains soy in any form. Learn how to make your own healthier versions at home to save money and your health.

Food #2 — Grains, Especially Gluten

Grains provide the foundation of the modern American diet. Simply refer to the former USDA Food Pyramid and the current and slightly better My Plate, and you’ll quickly see that our government promotes a diet heavily comprised of wheat, corn, pasta, bread, rice, and other whole grain products.

Most of these products contain gluten — and there is strong evidence to support the link between gluten sensitivity/celiac disease and autoimmune thyroid diseases. The body recognizes gluten as a foreign invader, sends antibodies to attack it, and those antibodies attack the thyroid in the process. (Source.)

Hashimoto’s is one such autoimmune thyroid condition where gluten, and indeed most grains, are a big no-no.

Since most triggers of Hashimoto’s disease are dietary, most people if not all who have Hashimoto’s have increased intestinal permeability or leaky gut syndrome and impaired blood sugar metabolism. The best way to allow the intestine to heal, eliminate blood sugar swings, and to lose body fat is by avoiding all grain products and sweets. (Source.)

What About Going Gluten-Free?

Often, going “gluten-free” isn’t enough since so many gluten-free products are still highly refined and because many foods are cross-reactive. The body perceives these cross-reactive foods as it perceives gluten. Even though these foods are gluten-free, their protein structure is so similar to gluten that the body sends antibodies to fight them.

Gluten cross-reactive foods include coffee, dairy, milk chocolate, tapioca, soy, hemp, potato, and eggs. These grains are cross-reactive too: corn, oats, millet, sorghum, buckwheat, amaranth, quinoa, teff, and rice (source). All of those foods are technically gluten-free, yet the body reacts to them with an autoimmune response as if they were wheat, rye, spelt, or kamut.

Action Step: When giving up gluten doesn’t produce a drastic improvement in health, examining cross reactivity and eliminating ALL grains is the next step. In either case, grains should never be the foundation of anyone’s diet, especially someone with a thyroid condition.

Food #3 — Raw Cruciferous Veggies

Sources differ on this topic. Many claim the benefits of raw cruciferous vegetables far outweigh the risks they pose to the thyroid. Still others claim the exact opposite — raw crucifers are goitrogenic and should always be cooked prior to consuming.

The cruciferous family of veggies is rich in sulfur-containing compounds called glucosinolates — detoxifying and anti-cancerous substances which are very beneficial to the whole body (source). Cruciferous vegetables are sometimes called brassicas and include:

• broccoli and cauliflower
• cabbage
• brussels sprouts
• radishes
• turnips
• bok choy
• kohlrabi
• kale and other leafy greens like arugula, watercress, mustard greens, and collard greens

And they should be a part of everyone’s diet, in my opinion.

Yet they are also goitrogenic in nature. A goitrogen is a substance that interferes with the thyroid’s uptake of iodine. When the thyroid isn’t uptaking enough iodine, it swells to try to uptake more iodine. This forms a lump in the throat called a goiter. Health practitioners should always palpate your throat area to check for a goiter, which is a sure sign of a thyroid problem.

Some argue, however, that though goiters arecaused by interference in the uptake of iodine, that uptake isn’t blocked by food. Rather, they say, goiters are caused by inflammation from chronic autoimmune thyroid disease, such as Hashimoto’s. The solution, then, is to treat the autoimmune thyroid condition, not to remove goitrogenic foods like cruciferous veggies from the diet. (Source.)

So, Should Cruciferous Vegetables Be Consumed Raw Or Not?

That is the question.

I tend to sit in the better-safe-than-sorry camp. Though many trusted sources assure us of their safety, just as many warn against consuming raw crucifers.

Cooking deactivates the goitrogenic compounds in much the same way that steaming deactivates the oxalates in raw spinach and kale. These foods still contain copious vitamins and minerals, even after cooking, so I see no reason not to enjoy them cooked on a regular basis.

And it’s my personal opinion that they’re much tastier cooked as well. I mean… raw turnips or raw bok choy? I’d choose roasted broccoli over raw broccoli any day of the week! 😉

Action Step: Enjoy plenty of vitamin-rich cruciferous vegetables since they contain so many of the essential nutrients needed for proper thyroid function. Just limit raw consumption of them if your practitioner, doctor, or you feel they may cause you to develop a goiter.

Food #4 — Caffeine

Can you imagine starting your day without coffee?

If you can’t, that’s a good sign you rely on it for energy.

Caffeine dependence is detrimental to your thyroid and adrenal glands. Caffeine actually destabilizes blood sugar and masks your body’s signals that it needs rest. Once this cycle begins, it is very difficult to stop.

Even worse, did you know that caffeine blocks the absorption of thyroid replacement hormone? So if you already know you have thyroid disease and you take thyroid replacement hormone, like Armour or Synthroid, your morning cup of coffee is actually blocking those hormones from being absorbed! (Source.)

According to researchers, “Caffeine has been shown to markedly alter…thyroid stimulating hormone (TSH), and thyroid hormones in animal studies” (source).

Giving up caffeine can be harder than quitting sugar and gluten, combined. Believe it or not, caffeine is actually a drug — a very addictive drug because it stimulates the nervous system, providing a feeling of alertness and energy that might not be there otherwise (source).

What about decaf?

It’s a disputed area, but many health practitioners don’t suggest it for two reasons. For one, many manufacturers use a chemical process to remove caffeine from the coffee beans. The result is less caffeine, but more chemicals. (Source.)

Learning to live without this stimulant will benefit your thyroid’s function.

Action Step: Quit all caffeine. You can go cold turkey or titrate the amount you consume down over the course of days or weeks. Try these 12 Natural Energy-Boosting Drinks Without Caffeine or (my favorite) DIY Herbal Coffee Substitutes to replace your morning cup.

Food #5 — Sugar

Unstable blood sugar and thyroid problems often go hand-in-hand. To maintain a balanced blood sugar, the thyroid must be healthy. To maintain a healthy thyroid, the blood sugar must be stable. You can’t have one without the other.

All forms of refined carbohydrates, especially from processed foods, require extra insulin to lower the drastic spike in blood glucose that these foods cause. Over time, this leads to insulin resistance — more insulin is required as the blood sugar becomes higher and higher. Hypoglycemia (low blood sugar) and insulin resistance are precursors to diabetes. Surprisingly, it all comes back to our hormones. When the blood sugar is out of whack, so are the hormones. And so, the vicious cycle goes…

Ironically, even someone with normal blood sugar can present with symptoms of hypoglycemia (dizziness, shakiness, fainting, headache, hunger, irritability)if they’re hypothyroid. The body’s cells aren’t sensitive to glucose, less glucose is absorbed in the gut, the response of insulin to lower blood sugar is slower, and it feels like hypoglycemia — even when it isn’t. The cells don’t get the glucose they need, so the body is in distress. The adrenals secrete the stress hormone cortisol. And thyroid function is further impaired. (Source.)

Let Me Clarify: What Does “Sugar” Mean?

To make things simple, let me clarify what I mean when I say “sugar”. Because I’m not just talking about white cane sugar — although that’s certainly included.

“Sugar” is the umbrella under which all sorts of refined, glucose-spiking foods fall:

• boxed breakfast cereals, granola bars, and “energy” bars
• candy, gummy treats, even health food store treats
• almost all pre-made snack foods, including cookies and chips
• sodas and energy drinks — even “natural” ones
• refined rice and pasta
• high fructose corn syrup
• commercial salad dressings and condiments
• and even whole sweeteners like honey, maple syrup, and coconut sugar for those with serious thyroid and/or blood sugar problems

Does Quitting Sugar Seem Impossible To You?

In this revealing article, Sarah Wilson, author of the book I Quit Sugar, shares her story of battling Hashimoto’s. She says,

Quitting sugar, quite frankly, is mandatory if you have an autoimmune disease. Sugar causes leaky gut (often cited as the precursor to autoimmune disease). Sugar inflames and mucks with the entire endocrine system and insulin spikes destroy the thyroid gland. In addition to the damage caused by insulin, a compromised thyroid gland will slow the removal of insulin from the bloodstream.

So if you have a thyroid disease and you earnestly want to heal, you MUST give up sugar in all its forms. You must be diligent toread labels in any prepared foods you buy because, truly, sugar is lurking everywhere.

If this seems impossible, believe me, I thought it was too. Until I did it. Now I can’t imagine sugar as a regular part of my lifestyle when I’m enjoying so many foods and even sweets without it! Here are some posts you may find helpful as you choose to heal naturally. Quitting sugar is a GREAT first step!

• 7 Tips For Overcoming Sugar Addiction
• Overcoming Sugar Addiction podcast
• Post-Holiday Sugar Detox In 4 Simple Steps
• Beyond Sugar: Overcoming The Withdrawal Symptoms Of No Sugar
• Pantry Staples For 21-Day Sugar Detox Success

Action Step: Begin phasing sugar, refined carbs, high-glycemic foods, and processed foods out of your diet. Read labels on any pre-made foods you buy and watch out for sugar in all its forms. Try stevia if you desire something sweet.

Food #6 — Fluoridated Water

Fluoride is a toxic drug linked with an array of potentially serious health problems. Most recently, research linking fluoridated water consumption to thyroid dysfunction received attention in both British and American media...Despite irrefutable evidence of harm, the United States still adds fluoride to municipal water supplies reaching nearly 211 million Americans. As of 2012, more than 67 percent of Americans receive fluoridated water.Of those, more than 11 million people receive fluoride at or above what has been deemed the ‘optimal’ level, according to the US Centers for Disease Control and Prevention (CDC). (Source.)

Fluoride is a major problem in the U.S. because our population is constantly inundated with a continuous supply of this toxic substance. Not only is it added to our drinking water, it’s also in our air. It’s in our toothpaste, and dentists urge us to get a fluoride treatment every time we sit in the dentist chair.

As cited in this Newsweek article, a study compared 2 cities in England. The city of Manchester didn’t add fluoride to its water; the city of Birmingham did. The researchers concluded that the doctor’s offices in Birmingham were twice as likely to report cases of underactive thyroid (hypothyroidism) than the doctors in Manchester.

But those 2 cities weren’t the only ones studied. In fact, this study covered 99% of England’s general medical practices. “Considering the comprehensiveness of this study—it covered nearly the whole of England—regional differences in fluoride intake or other confounding factors are unlikely to have played a role in the striking results” (source).

How Does Fluoride Damage the Thyroid?

In 4 ways…

1. Iodine attaches to the amino acid tyrosine to then convert into T4 and T3. Fluoride slows this process.
2. Fluoride “switches off” the uptake of active thyroid hormone (T4) into each cell.
3. TSH stimulation by the pituitary gland is impaired because of fluoride causing a reduced output of thyroid hormones.
4. Every cell in the body has a receptor site for TSH and T4. Fluoride competes for these receptor sites on the thyroid and in the cells, so the thyroid produces less thyroid hormone, and the cells receive less thyroid hormone. (Source.)

Action Step: Don’t drink tap water. Explore various water filtration options and choose one that removes fluoride from drinking water while retainingvaluable minerals. Also, invest in shower head filters that remove both chlorine and fluoride from bathing water. Use natural, non-fluoridated dental products and refuse fluoride treatments at the dentist’s office.

Food #7 — Vegetable Oils

Though the rise in heart disease and obesity correlates with the rise in vegetable oil consumption and decrease in consumption ofsaturated fats, vegetable oils are still promoted as healthy fats. And people still believe it.

Vegetable oils — canola, corn, soybean, cottonseed, sunflower, safflower, and peanut — were non-existent until the 1900s when new technology and government subsidies provided these cheap fat substitutes.

How are vegetable oils made? I love this oversimplified description from Thank Your Body:

Find some “canola seeds.” Oh wait, they don’t exist. Canola oil is actually made from a hybrid version of the rapeseed… most likely genetically modified and heavily treated with pesticides.

Heat the rapeseeds at unnaturally high temperatures so that they oxidize and are rancid before you ever buy them.

Process with a petroleum solvent to extract the oils.

Heat some more and add some acid to remove any nasty wax solids that formed during the first processing.

Treat the oil with more chemicals to improve the color.

Deodorize the oil to mask the horrific smell from the chemical processing.

Of course, if you want to take your vegetable oils one step further, just hydrogenate it until it becomes a solid. Now you have margarine and all its trans-fatty wonder.

The healthiest cooking oils and fats are those which are obtained by churning (butter), pressing (olive oil, coconut oil, avocado oil), and rendering (tallow and lard). None of these are chemical extraction processes. They have been used for thousands of years to provide people worldwide with nutrient-dense fats for eating and cooking, and the process for producing them is still largely unchanged.

So, Why Are Vegetable Oils So Bad For The Thyroid?

2 words: polyunsaturated fats.

Polyunsaturated fats (or PUFAs) impair and slow thyroid function in 3 ways (source):

1. They block the thyroid from secreting thyroid hormone.
2. They block the transport of thyroid hormone through the bloodstream to the cells.
3. And, they block the cells from properly utilizing the thyroid hormone that is available.

And I’ll throw out 2 more reasons:

1. Vegetable oils sustain systemic inflammation. Remember, a sick thyroid is an inflamed thyroid.
2. Vegetable oils are genetically modified, and who knows what GMOs are doing to our thyroids?!

Action Step: The only way to stop the inflammation and thyroid suppression that vegetable oils cause is to avoid them completely. Choose traditional, nourishing, unprocessed fats: butter, ghee, coconut oil, palm oil, tallow, and lard.

As you seek to treat your thyroid holistically, I highly recommend working with a functional medicine practitioner or naturopath to find a diet, supplements, and lifestyle that work for YOU. There is no one-size-fits-all approach to any disease.

Yet it is so interesting that the very foods that nourish the thyroid are some of the same nutrient-dense foods we talk about all the time at Traditional Cooking School. And the same foods that weaken your immune system are weakening your thyroid as well.

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Are you dealing with hypothyroidism, hyperthyroidism, Hashimoto’s, or other thyroid disease? How is nutrition playing a role in your life?

More helpful articles related to supporting thyroid function:

• 5 Supplements To Consider Taking This Year
• Top 5 Supplements For Hashimoto’s
• Top 5 Herbs For Thyroid Support
• Do Fermented Cruciferous Vegetables Like Sauerkraut Hurt The Thyroid? #AskWardee 063
• 7 Foods That Nourish Your Thyroid.
• 8 Reasons Why We’re Sick Even If We Eat Healthy
• Which Whole House Water Filtration System We Chose And Why #AskWardee 134