Let us talk about the little gland at the base of your neck, because I do not think it gets nearly enough credit!
Your thyroid is about the size of a butterfly and it sits right below your voice box. It is small, it is quiet, and it has its hands in almost everything: your energy, your body temperature, your heart rate, your digestion, your hair, your skin, your mood, your cycle.
Hormone health is my whole specialty, and the thyroid is one of the conversations I have most often with the women I work with. So today I want to hand you something practical. Not a diagnosis, because that is not mine to give. Something better for a ten minute appointment: the right questions.
The quick version
Your thyroid works like the thermostat for your whole body.
The symptoms it causes are easy to blame on stress, age or motherhood.
It depends on a specific short list of nutrients to do its job.
You are allowed to ask questions, and good questions get better answers.
Your thyroid is the thermostat
Here is the easiest way I know to picture it. Every house has a thermostat, and when it is set correctly you never think about it. The house is comfortable. Things run.
When that thermostat drifts even a little, you feel it everywhere. Some rooms are freezing. The furnace runs too hard or barely at all. Nothing is broken exactly, but nothing is quite right either.
That is your thyroid. It makes hormones that tell nearly every cell in your body how fast to work. Your thyroid makes mostly a storage form called T4, and your body converts that into the more active form, T3, out in your tissues where the work actually happens. That conversion step matters a great deal, and as you will see in a minute, it needs nutrients to happen.
The symptoms that get brushed off
This is the part that gets me fired up, so I will be direct with you.
The symptoms connected to thyroid function are almost perfectly designed to be dismissed. Not because anybody is careless, but because every single one of them has an easy explanation sitting right next to it.
Exhaustion. The kind that sleep does not fix. You went to bed at a decent hour and you woke up feeling like you never went to bed at all. This gets blamed on a busy season, on a teenager, on being over forty.
Feeling cold. You are in a cardigan in July. Your hands and feet are cold in a warm room. You have become the person who travels with a blanket. This gets blamed on being a woman, and then everybody moves on.
Thinning hair. More in the brush, more in the drain, a ponytail that got noticeably smaller. Maybe your eyebrows thinned out at the outer edges. This gets blamed on stress, or on postpartum, or on hormones in the vaguest possible sense.
Brain fog. Words that will not come. Walking into a room and having no idea why. Reading the same paragraph three times. This gets blamed on perimenopause, on multitasking, on simply having too much going on.
And here is the thing. Sometimes those easy explanations are the right ones! A hard season really does make you tired. But when four of these are living together in the same body at the same time, and they have been hanging around for months, that deserves a real conversation instead of a shrug.
Tired all the time is common. That does not make it normal.
I say that a lot and I mean it every time. Common is what a lot of people experience. Normal is what is right for your body. Those are two completely different words, and somewhere along the way women got taught to accept the first one as if it were the second.
The nutrients your thyroid runs on
This is my favorite part, because this is where food and supplementation come in, and it is where you have real influence.
Think of your thyroid as a small workshop with a very specific supply list. It does not need everything. It needs these, and it needs them consistently.
Iodine, the raw material
Iodine is the ingredient your thyroid hormones are literally built out of. There is no substitute and no workaround. Your body cannot make iodine, so every bit of it comes from what you eat.
You will find it in sea vegetables like nori and kelp, in cod and other fish, in shrimp, in dairy, in eggs, and in iodized salt. That last one is worth a pause. A lot of us switched to sea salt or pink salt years ago, and most of those are not iodized. It was a small swap that quietly changed something.
Now, iodine is a nutrient where balance really is the whole story. Your thyroid can be unhappy with too little and it can also be unhappy with too much, and that is not true of every nutrient. This is exactly why I want it on your list of things to talk over with your doctor rather than something you guess at on your own.
Selenium, the converter
Remember that conversion from the storage form to the active form? Selenium runs it. The enzymes that do that job are built with selenium, and your thyroid holds more selenium per gram of tissue than any other organ in your body. It clearly knows what it is doing.
Selenium wears a second hat, too. Making thyroid hormone is a little messy at the cellular level, and selenium is part of the cleanup crew that protects the gland from that everyday wear and tear.
Brazil nuts are the superstar here by a wide margin. Seafood, eggs, poultry, sunflower seeds and whole grains all contribute. Selenium is another one where more is not automatically better, so it belongs in the conversation with your provider.
Zinc, the one that works both ends
Zinc helps your body build thyroid hormone and it helps with that conversion step as well. It shows up at both ends of the line. There is a nice loop here, too, because thyroid hormone helps you absorb zinc in the first place, so the two of them tend to rise and fall together.
Oysters are the champion. Beef, pumpkin seeds, cashews, chickpeas, lentils and yogurt are all good friends to have.
Iron, the spark
The enzyme that assembles thyroid hormone is iron dependent. Without enough iron, that assembly line slows down no matter how much iodine you are eating. I think of iron as the spark that gets the whole thing going.
This one matters enormously for women, because between menstruation, pregnancy and plant-forward eating, low iron is genuinely common in the women I work with.
Look to red meat, liver, oysters, sardines, lentils, beans, pumpkin seeds and dark leafy greens. And a tip I love: pair plant sources of iron with something rich in vitamin C, like peppers, citrus or strawberries. Vitamin C holds the door open so your body can take more of that iron in.
Tyrosine, the other half of the recipe
If iodine is one ingredient, tyrosine is the other. Thyroid hormone is essentially tyrosine with iodine attached. Tyrosine is an amino acid, which means you get it from protein, and your body can also make it from another amino acid.
Eggs, fish, poultry, beef, dairy, soy, pumpkin seeds and beans all deliver. Honestly, this is one more reason I want women eating enough protein. It is not just about muscle.
Vitamin D, the messenger
Vitamin D acts like a hormone in your body, and it is deeply involved in keeping your immune system balanced. That is why it comes up so often in conversations about autoimmune wellness, and researchers have taken a real interest in the relationship between vitamin D status and thyroid health.
Sunshine is the original source, plus salmon, trout, sardines, egg yolks, UV-exposed mushrooms and fortified foods. If you want the long version, I wrote a whole post about vitamin D in my Nutrition A to Z series.
Food first, then fill the gaps
You know how I feel about this. Food is always where I start, because food brings the whole package: the nutrient plus everything that helps you use it.
And I am going to be honest with you about the other half of the picture. Our food supply is not what it was, our soils are not what they were, and our lives are busier than the lives our grandmothers were eating for. A beautiful whole-food plate is the foundation, and quality supplementation is how you close the distance between the foundation and what your body actually needs. I believe in that wholeheartedly, and I believe in doing it thoughtfully, with a provider who knows your full picture.
Notice how many of these nutrients overlap in the same foods. Oysters bring zinc and iron and selenium. Eggs bring iodine, selenium, tyrosine and vitamin D. Sardines bring iron, selenium and D. Your thyroid is not asking for six separate projects. It is asking for a real plate.
Two timing notes worth knowing. If you take thyroid medication, calcium and iron supplements can interfere with how much of it your body absorbs, and so can soy, coffee and high-fiber foods taken at the same time. Nobody is telling you to give any of that up, it is simply a question of spacing things out, and your pharmacist or doctor can tell you exactly how. Separately, biotin, which shows up in a lot of hair, skin and nail formulas, can skew certain lab results. That does not mean biotin is a problem, it means your provider needs to know you take it.
Questions worth bringing to your doctor
Here is what I actually want you to do with all of this. Write these down, bring them in, and do not apologize for having them. A prepared patient is a gift to a good doctor.
I have been exhausted, cold all the time and foggy for months now. Could my thyroid be part of this picture, and what would you want to look at?
Thyroid conditions run in my family. Does that change how you would approach this with me?
I have been curious about iodine. Is that something worth paying attention to in my situation, or could more of it work against me?
Here is a list of everything I take, supplements included. Do any of these interact with my medication or affect my results?
Are there nutrients worth paying closer attention to for me right now, and how would we follow up from here?
One more thing. If you leave that appointment and you still feel unheard, you are allowed to ask again, and you are allowed to ask someone else. That is not being difficult. That is being your own advocate, and I will cheer for you every time.
My take
I trained at the Institute for Integrative Nutrition starting in 2012, and I have been continuing my education through IIN since 2023, and the thing I keep coming back to is this: your body is not being dramatic. It is reporting.
Exhaustion is information. Being cold is information. The hair in the brush is information. None of it means something is wrong, and none of it means something is fine. It means there is a conversation to have, with someone who has the training to look properly.
My job is the other half of that. Food, nutrients, sleep, stress, the daily rhythm that either supports your hormones or quietly works against them. Your doctor handles diagnosis. We handle the foundation underneath it. That team approach is the whole thing I believe in.
And it is fall, my favorite season of the entire year, which means soup weather. Which means a real excuse to get more of these foods on your plate without trying very hard.
Want to go deeper on your hormones? My free Hormone Health 101 guide is a great place to start, and if iron is on your mind after reading this, grab Improving Iron Levels while you are in there. Both are waiting in my free resource library.
And if you want the food side already done for you, my Thyroid meal plan is in the shop.
This post is for education only and is not medical advice. I am a Certified Holistic Health Coach. I do not diagnose, treat, prescribe for or cure any medical condition, and nothing here is intended to do so. Please talk with your healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medication, or managing a health condition.
Where this comes from
National Institutes of Health, Office of Dietary Supplements: fact sheets on Iodine, Selenium, Zinc, Iron and Vitamin D
Mayo Clinic: Hypothyroidism (underactive thyroid), overview and symptoms
Cleveland Clinic: Thyroid Disease and Hypothyroidism patient resources
American Thyroid Association: patient information on thyroid function and iodine
Zimmermann MB and Boelaert K, The Lancet Diabetes & Endocrinology, 2015: "Iodine deficiency and thyroid disorders"
Ventura M, Melo M and Carrilho F, International Journal of Endocrinology, 2017: "Selenium and Thyroid Disease: From Pathophysiology to Treatment"
U.S. Food and Drug Administration: safety communication and guidance on biotin interference with laboratory tests