By Maïté De Jaegher, co-founder Suplemint
What you eat every day can either support your thyroid or hold it back. And some foods you probably consider "healthy" could actually contribute to your fatigue, weight gain, and discomfort.
Here are 8 foods to watch for if you suspect a thyroid imbalance.
1. Gluten
Gluten can promote intestinal inflammation in some people, particularly those with non-celiac sensitivity. In these individuals, this inflammation can interfere with absorption of nutrients essential for the thyroid (iodine, selenium, zinc). This is not to demonize gluten, but rather to see whether temporary elimination improves your symptoms.
2. Non-fermented soy
Soy contains isoflavones that can interfere with the thyroid's use of iodine, especially when iodine intake is insufficient. Fermented forms (miso, tempeh, tamari) are generally better tolerated.
3. Excessive raw cruciferous vegetables
Broccoli, cabbage, cauliflower, kale... These vegetables are excellent for health, but when eaten raw and in large amounts, they contain goitrogens that can inhibit the thyroid's absorption of iodine. Cooking greatly reduces this effect.
4. Refined sugar
Excess sugar promotes chronic inflammation and insulin resistance, two factors that can slow thyroid metabolism. It also contributes to energy fluctuations that worsen thyroid fatigue.
5. Dairy products (for some people)
Dairy can cause intestinal inflammation in people who are intolerant or sensitive. This inflammation can disrupt the absorption of your thyroid medication and essential micronutrients.
6. Ultra-processed foods
High in additives, preservatives and trans fats, they promote systemic inflammation and overload the liver — a key organ in converting T4 into T3.
7. Alcohol
Alcohol is directly toxic to thyroid cells and overloads the liver. Even moderate consumption can affect hormone production and slow your metabolism.
8. Too much coffee
Coffee stimulates the adrenals and increases cortisol. In excess, it can deplete your adrenal reserves and worsen fatigue. It can also interfere with the absorption of your thyroid medication if consumed too close to taking it.
The idea isn't to cut out everything
It's not about creating bans, but about becoming aware of the impact of certain foods on your thyroid. Each body is different. The most effective approach is often to try a temporary elimination (2-3 weeks) and observe whether your symptoms improve.
At the same time, supporting your thyroid with the right micronutrients — iodine, selenium, zinc, L-tyrosine — is essential to make up for deficiencies that your diet doesn't always cover.
Take the THYREN® test to discover your ideal pack
