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What foods should I avoid if I have an underactive thyroid?

In general, there are no particular foods to avoid if you have an underactive thyroid (hypothyroidism). However, if you are taking levothyroxine (Synthroid) for your underactive thyroid, you should avoid foods that may interfere with absorption of the drug from the gastrointestinal tract. These foods include:
  • soy (including soy formula and nutritional products)
  • grapefruit juice
  • espresso coffee
  • cottonseed meal
  • walnuts
  • dietary fiber
Natasha Turner, ND
Alternative & Complementary Medicine
If you have an underactive thyroid, some foods to avoid are raw cruciferous veggies, peanuts, mercury-rich fish, and processed soy products. Watch naturopathic doctor Natasha Turner, ND, share some foods to stay away from if your thyroid is slow.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.