Living With a Thyroid Condition: Diet, Medicine, Pregnancy

The short answer: Living well with a thyroid condition comes down to four habits: take your tablet the same way every single day on an empty stomach, keep your calcium and iron tablets hours away from it, get your TSH rechecked 6 to 8 weeks after any dose change, and tell your doctor the day your pregnancy test turns positive. You do not need a special thyroid diet. You do not need to give up cabbage, cauliflower or soya.

This guide is about living with a thyroid condition day to day. If you are still working out whether you have one, start with my guide to thyroid symptoms and which tests to ask for, then come back here.

How do I take my thyroid tablet correctly?

This is the part that decides whether your treatment works, and it is the part most women are never told properly. Levothyroxine is a fussy tablet. Food, and several common supplements, stop your body absorbing it.

The American Thyroid Association's advice is to take it first thing in the morning on an empty stomach, because food in the stomach affects absorption. Bedtime is a reasonable alternative if your stomach is empty by then, meaning well after your last food, your last drink other than water, and any medicines that interfere. What matters most is that you pick one way and keep to it every day.

Most doctors, myself included, tell women to leave at least 30 to 60 minutes between the tablet and breakfast. I count your morning tea or coffee as breakfast for this purpose, because anything in the stomach can get in the way.

What blocks your thyroid tablet

The American Thyroid Association names these as reducing absorption: iron, calcium, soya, certain antacids, and some cholesterol medicines. None of them are forbidden. They just need to be hours away from your tablet.

The biotin one catches many women out, because biotin is in most hair and nail supplements. It does not harm your thyroid. It makes the blood test give a wrong reading, so your doctor may change your dose based on a false number. Stop it for two to three days before any thyroid test.

One more thing the ATA advises: in general, stay on the same brand, or the same manufacturer's generic. If your chemist gives you a different make, tell your doctor so your levels can be rechecked.

Is there a thyroid diet? What about cabbage and soya?

No, there is no thyroid diet, and I want to take this fear away from you. I often meet women who have stopped eating cabbage, cauliflower or soya because of something they read.

Here is what is actually true. These foods contain goitrogens, substances that can block the thyroid taking up iodine. Harvard's nutrition reviewers are clear that this concerns mainly people who already have low iodine or an underactive thyroid. Cabbage is the vegetable named in that research. If your iodine intake is adequate, there is no reason to cut these foods out of a normal Indian plate.

So keep eating your cabbage palya, gobi sabzi, cauliflower, broccoli, soppu and soya. A varied plate does more for you than a fearful one. The only sensible caution is not to eat large amounts of soya right alongside your tablet, because soya reduces absorption.

How much iodine do you need?

Adult women need about 150 micrograms of iodine a day, rising to 220 micrograms in pregnancy and 290 micrograms while breastfeeding. Use salt labelled iodised in your normal cooking, but do not eat more salt to get more iodine.

What you should not do is start iodine supplements or kelp tablets on your own because a video told you to. High iodine intakes can push a thyroid the wrong way, and people with autoimmune thyroid disease or a history of iodine deficiency are among those most likely to be tipped into an underactive OR an overactive thyroid by too much.

There is one group who should actively ask rather than assume. If you are pregnant or breastfeeding, or you use a specialty non-iodised salt, or you eat very little dairy, egg or seafood, ask your doctor whether your prenatal supplement contains the right amount of iodine. Household salt is not always adequately iodised, and pregnancy raises the need.

What actually helps, day to day

• Protein at every meal. Dal, curd, eggs, paneer, fish or chicken. It steadies energy and helps with the weight that feels stuck.
• Iron and vitamin B12, if you are low. Tiredness in Indian women is very often iron, not thyroid, and the two feel identical. My guide to iron deficiency covers this. Just keep the iron tablet away from the thyroid tablet.
• Movement, most days. A brisk walk does more for the thyroid tiredness than any supplement sold for it.
• Sleep and stress. Neither causes thyroid disease, but both make the symptoms much louder. My guide to managing stress has the practical part.

Notice what is not on that list: selenium, ashwagandha, sea moss, detox teas, gluten-free eating. If a seller promises to "heal" your thyroid, they are selling something. Your tablet is the treatment.

What changes when you are pregnant?

Quite a lot, and this is the section to read twice if you are planning a baby. Your body needs more thyroid hormone in pregnancy, from very early on, and the baby's brain development depends on it.

Tell your doctor the day your pregnancy test is positive, not at your first scan. If you are already on levothyroxine, the need for the hormone rises straight away, and the American Thyroid Association's guidance is that the dose typically goes up by roughly 20 to 30%.

How you make that change is not something to work out alone. If your doctor has already given you a pregnancy dose plan, follow it the day the test is positive and tell the clinic the same day. If you do not have one, contact the clinic before changing anything, because the right step depends on your dose, your reports and your own history.

The monitoring in pregnancy is tighter too. In short:

• Thyroid function is checked at least every 4 weeks, and again after any dose change.
• Where the lab has no pregnancy-specific range, a TSH above 4 mU/L is treated as abnormal.
• If you are on treatment, the aim is a TSH between the lower end of the normal range and 2.5 mU/L. A result of 3.5 does not mean you are optimally dosed.
• Subclinical hypothyroidism means the TSH is high but the thyroid hormone itself is still normal. Here treatment is advised if you carry thyroid antibodies, and at a TSH above 10 mU/L if you do not.

This matters because untreated hypothyroidism in pregnancy is linked to preeclampsia, anaemia, miscarriage, low birth weight and stillbirth, and untreated hypothyroidism in the first trimester can affect the baby's IQ and development. Those are the outcomes listed by the US National Institute of Diabetes and Digestive and Kidney Diseases. Treated properly, most women have entirely normal pregnancies. That is the whole point of being careful early.

Why do I still feel tired if my TSH is normal?

This is the most common question I get, and it deserves an honest answer rather than a supplement.

First, check the number is genuinely settled, not one reading taken soon after a dose change. Second, look for the other causes that feel exactly like hypothyroidism: low iron, low vitamin B12, low vitamin D, poor sleep, depression, and simple overwork. In Indian women, iron deficiency is extremely common, and it is the first thing I look for.

Third, be patient with the timeline. Symptoms lift over weeks and months, not days. If you have been at a steady dose with a normal TSH for three months and still feel wrong, that is worth a proper consultation, not a bigger dose bought on your own.

Your questions, answered

Can I stop my thyroid tablet once I feel better?

No. Feeling better is the medicine working, not the condition leaving. An underactive thyroid from autoimmune damage is usually lifelong, and stopping brings the symptoms back over weeks. Never stop or change your dose without your doctor.

What if I forget a dose?

One missed dose is not an emergency. Take it when you remember on the same day. For a dose you have completely missed, follow the instructions on your own prescription leaflet or ask your pharmacist, and never try to make up several missed doses at once. Tell your doctor if you are missing doses often, because your test results will not make sense.

Will my thyroid tablet make me gain or lose weight?

Correctly dosed, it should help the sluggish weight gain settle, not cause dramatic loss. Thyroid medicine is not a weight-loss drug, and taking more than you need is genuinely dangerous for your heart and your bones.

Can I get pregnant with a thyroid problem?

Yes. A well-controlled thyroid is compatible with a normal pregnancy. Get your TSH checked before you start trying, tell your doctor as soon as the test is positive, and expect closer monitoring through the pregnancy.

Do I need to avoid cabbage, cauliflower and soya?

No. In normal cooked portions these are safe when your iodine intake is adequate. Just avoid taking a large soya meal at the same moment as your tablet, because soya reduces absorption.

Should I take a selenium or iodine supplement?

Not on your own. Iodised salt already covers your iodine, and extra iodine can push the thyroid the wrong way, especially in autoimmune disease. Ask your own doctor before adding any supplement.

My periods are still heavy even on treatment. Is that the thyroid?

It may not be. Heavy bleeding much more often comes from fibroids, hormone changes or the lining of the womb, and the UK NICE guideline, which Indian practice broadly follows, says not to test thyroid for heavy periods alone unless there are other thyroid signs. My guide to what causes heavy periods works through the real list, and if the cycle is irregular rather than heavy, see my irregular periods guide.

Sources for this article (8)

1. American Thyroid Association, Thyroid hormone treatment (accessed July 2026)
2. American Thyroid Association, Hypothyroidism: patient information (accessed July 2026)
3. American Thyroid Association, Management of hypothyroidism during pregnancy (accessed July 2026)
4. Harvard T.H. Chan School of Public Health, The Nutrition Source: Iodine (accessed July 2026)
5. MotherToBaby / NIH Bookshelf, Iodine fact sheet (accessed July 2026)
6. NIDDK, Hypothyroidism: symptoms and causes (accessed July 2026)
7. NIDDK, Pregnancy and thyroid disease (accessed July 2026)
8. NICE guideline NG88, Heavy menstrual bleeding: assessment and management (accessed July 2026)

This article is for your information and learning. It is not a substitute for a consultation. For advice about your own health, talk to me or your own doctor.