A Hashimoto's diagnosis, or a high anti-TPO result on your report, can make you wonder whether your body is working against you when you are trying for a baby. The reassuring truth is that Hashimoto's can make conception harder for some women, but it rarely closes the door, and much of what affects fertility here is modifiable. To see where you stand, request your Fertility assessment score, speak to our dietitian, or view our pricing. This guide explains how Hashimoto's affects fertility, what diet and lifestyle can realistically do, and what to check before you try.
Quick answer: Is it harder to conceive with Hashimoto's?
It can be, mainly when thyroid hormone levels are poorly controlled, because this may disturb ovulation and raise miscarriage risk. Many women with Hashimoto's conceive naturally once TSH is optimised under medical guidance. Nutrition and lifestyle support thyroid health, nutrient adequacy and metabolic balance, but they work alongside, not instead of, thyroid medication and fertility care.
In this article
- How Hashimoto's can make it hard to conceive
- Is it possible to conceive with Hashimoto's?
- Can you conceive naturally if you improve diet and lifestyle?
- Can you reduce anti-TPO and still conceive?
- Role of diet and lifestyle
- Foods for fertility and Hashimoto's
- What to check before trying
- FAQs
How can Hashimoto's make it hard to conceive?
Hashimoto's thyroiditis is an autoimmune condition in which antibodies, including anti-TPO, gradually damage the thyroid. Over time this can lead to an underactive thyroid (hypothyroidism). Fertility is affected through two separate routes: thyroid hormone levels, and the autoimmunity itself.
| Pathway | What can happen |
|---|---|
| Low thyroid hormone | Irregular or anovulatory cycles, heavier periods, a shorter luteal phase, raised prolactin |
| Subclinical hypothyroidism | TSH mildly raised with normal T4; relevance for fertility is debated, but it is treated in IVF and in anti-TPO positive women |
| Thyroid antibodies | Associated with a higher risk of miscarriage and preterm birth, even when TSH is normal |
| Overlapping conditions | PCOS, insulin resistance, coeliac disease, vitamin D and B12 deficiency, and other autoimmune conditions are more common |
| Male partner | Thyroid imbalance in men can affect semen parameters, so he should be assessed as well |
Note that having antibodies does not mean you will struggle. Anti-TPO is present in roughly one in ten women with otherwise normal thyroid function, and most still conceive.
Practical takeaway: The biggest modifiable factor is usually thyroid hormone control, so that is where preparation starts.
Is it possible to conceive with Hashimoto's?
Yes. Women with Hashimoto's conceive naturally and through IUI and IVF every day. The key is entering pregnancy with well-managed thyroid function.
The American Thyroid Association advises that women treated for hypothyroidism who are planning pregnancy aim for a TSH between the lower end of the reference range and 2.5 mIU/L before conception. Your endocrinologist sets your own target, and the dose often needs to increase early in pregnancy, which is why TSH is rechecked frequently.
For IVF, guidelines support treating subclinical hypothyroidism, because outcomes are better studied in that setting.
Practical takeaway: Optimised TSH, a thorough fertility work-up for both partners and early preconception planning matter more than the diagnosis label.
Can you conceive naturally if you improve diet, lifestyle and Hashimoto's control?
For many women, yes, and this is where preparation pays off. When TSH is optimised and ovulation becomes regular, natural conception is a realistic expectation, assuming no other factors such as tubal problems, severe male factor issues or advanced age are involved.
What nutrition and lifestyle can do is support the modifiable parts: stable blood sugar, adequate micronutrients, healthy body composition, sleep, stress regulation and gut health. This matters especially if PCOS or insulin resistance overlaps with Hashimoto's.
What it cannot do is reverse autoimmune thyroid disease, replace levothyroxine or guarantee pregnancy. Age, ovarian reserve, tubal health and sperm quality still shape the timeline, so a woman over 35 who has not conceived within six months should not wait.
Practical takeaway: Think of diet and lifestyle as strengthening the foundation while medical care corrects the thyroid.
Can you reduce anti-TPO and still conceive?
You can conceive without lowering anti-TPO. Antibody levels fluctuate, and there is no established diet that reliably reduces them.
The evidence is worth knowing. The large TABLET trial of 952 women with anti-TPO antibodies and normal thyroid function found that levothyroxine did not improve live-birth rates compared with placebo (37.4% versus 37.9%). Antibodies are therefore a marker to monitor, not a reason to panic, and treatment decisions depend on your TSH, history and whether you are doing IVF.
Some small studies suggest selenium may lower antibody titres, but there is no clear evidence that it improves fertility or live-birth outcomes, and excess selenium is harmful. Avoid high-dose supplements unless your doctor advises them.
Lifestyle measures such as correcting deficiencies, managing stress, sleeping well and treating gut issues are reasonable for overall immune and thyroid health, but should not be promised to reduce antibodies.
Practical takeaway: Aim for good thyroid control and nutritional adequacy, rather than chasing an antibody number.
What is the role of diet and lifestyle in Hashimoto's and fertility?
- Nutrient adequacy: Iodine, selenium, iron, zinc, vitamin D and B12 all influence thyroid function. Correct deficiencies on test results, not by guessing.
- Blood sugar balance: Steady glucose supports ovulation, particularly with PCOS or insulin resistance.
- Adequate protein and calories: Crash diets can suppress ovulation and worsen fatigue.
- Medication routine: Take levothyroxine on an empty stomach, 30 to 60 minutes before breakfast, and keep iron, calcium and multivitamins about four hours apart.
- Gut health: Hashimoto's is linked with coeliac disease. Test before going gluten-free, since evidence for gluten-free diets in people without coeliac is limited.
- Stress and sleep: Chronic stress and poor sleep disturb cycles and immune balance.
- Movement: Regular moderate exercise helps insulin sensitivity.
- Smoking and alcohol: Avoid smoking and limit alcohol.
Practical takeaway: Consistency in small daily habits does more than strict, restrictive diets.
What foods should you eat for fertility and Hashimoto's?
Focus on a balanced, nutrient-dense pattern, not a single "thyroid superfood".
| Nutrient | Food sources | Why it matters |
|---|---|---|
| Protein | Eggs, dal, paneer, fish, chicken, tofu, Greek yoghurt | Hormone and egg-cell building blocks, steadier glucose |
| Iodine (adequate, not excess) | Iodised salt, dairy, eggs, fish | Thyroid hormone production; excess can worsen autoimmunity |
| Selenium (from food) | Brazil nuts (1 to 2 a day), eggs, fish, sunflower seeds | Supports thyroid enzymes |
| Iron and B12 | Leafy greens, legumes, eggs, meat, fish, dairy | Common gaps in Hashimoto's |
| Vitamin D | Sunlight, oily fish, eggs; supplement if low | Immune regulation |
| Omega-3 fats | Fatty fish, flax, walnuts, chia | Anti-inflammatory support |
| Fibre and colour | Vegetables, fruit, millets, oats, legumes | Gut health, glucose control |
Avoid high-dose kelp or seaweed supplements, and limit ultra-processed foods and sugary drinks. Cooked cruciferous vegetables such as broccoli and cauliflower are fine in normal amounts.
Practical takeaway: Build each plate around protein, fibre and varied vegetables, and test nutrients before supplementing.
What should you check before trying to conceive?
- TSH, free T4 and anti-TPO: Review with your endocrinologist and set a TSH target.
- Medication timing and dose: Never stop or change levothyroxine on your own.
- Nutrient levels: Vitamin D, B12, ferritin and glucose or HbA1c.
- Folic acid: Usually at least 400 mcg daily from before conception; confirm your dose.
- Fertility assessment: Cycle regularity, ovarian reserve if relevant, and a partner semen analysis.
- Timing: If you are under 35 and have not conceived after 12 months, or over 35 after 6 months, consult a fertility specialist.
Frequently asked questions
1. Can you get pregnant naturally with Hashimoto's? Yes. Many women conceive naturally, especially once TSH is well controlled and ovulation is regular.
2. Does Hashimoto's cause infertility? Not by itself. It can contribute to irregular ovulation and miscarriage risk, but most women with Hashimoto's are fertile with good management.
3. Does high anti-TPO affect fertility? It is associated with higher miscarriage risk, but conception is still possible. Levothyroxine did not raise live births in women with normal thyroid function in the TABLET trial.
4. What TSH is ideal for trying to conceive? Guidelines suggest below 2.5 mIU/L for women treated for hypothyroidism, though your doctor will individualise it.
5. Can diet cure Hashimoto's or lower anti-TPO? No diet cures it, and none reliably lowers antibodies. Diet supports thyroid health, nutrient status and metabolic balance.
6. Do I need IVF if I have Hashimoto's? Not necessarily. IVF depends on other factors such as age, tubes and sperm. Thyroid control is important if you do proceed.
7. Is it safe to take selenium or iodine supplements? Only if your doctor advises. Both can be harmful in excess, so test and use food first.
Take the next step
Every thyroid and fertility picture is different. At Health Hatch, our dietitians, with about 13 years of clinical experience, build thyroid and fertility nutrition plans around your labs, food preferences and schedule, working alongside your doctor and fertility specialist. Begin by requesting your Fertility assessment score, speak to our dietitian, or explore our programs and current pricing.
Written by the Health Hatch Nutrition Team. Reviewed [date]. This article is educational and does not replace medical advice from your doctor.
References (verify before publishing)
- Dhillon-Smith RK et al. Levothyroxine in Women with Thyroid Peroxidase Antibodies before Conception (TABLET). N Engl J Med 2019;380:1316-25.
- Alexander EK et al. 2017 Guidelines of the American Thyroid Association for the Diagnosis and Management of Thyroid Disease During Pregnancy and the Postpartum. Thyroid 2017.
- ESHRE guideline on recurrent pregnancy loss (2022/2023) and ASRM guidance on thyroid autoimmunity and infertility.
- Systematic reviews on selenium supplementation and thyroid autoimmunity (to be confirmed against PubMed before publishing).