Slow Thyroid Foods to Avoid

The thyroid performs important functions for the human body, including controlling metabolism. Those who have slow thyroid glands, meaning those that don't produce enough of the hormones the body needs, have a condition known as hypothyroidism. This condition is controlled using medication. However, there are some foods that can interfere with this medication and, as such, should be avoided.

Soy

There have been some studies that show that soy products might interfere with the absorption of synthetic thyroid hormones, making it necessary to increase the dosage of these drugs, according to a review published in Thyroid. Those who eat soy products need to ensure they get plenty of iodine, and don't necessarily need to avoid soy altogether.

Nuts & Seeds

Some types of nuts and seeds, including linseed, walnuts, pine nuts, and peanuts, could also interfere with thyroid function, according to the University of Maryland Medical Center.

High-Fiber Foods

According to the Mayo Clinic, eating too much fiber can also affect the absorption of synthetic thyroid hormones. This means that it is important not to eat too many foods considered to be high in fiber, although fiber is normally considered to be an important component of a healthy diet. Some vegetables, including turnips and cassava, and grains such as millet, should not be consumed in large quantities for this reason.

Flavonoids

Flavonoids have generally been thought of as being promoters of good health. However, according to an article in Biofactors, these compounds have been found to interfere with the synthesis and availability of thyroid hormones when eaten in large amounts. Those with thyroid problems should limit foods high in these compounds, including broccoli, Brussels sprouts, cabbage, cauliflower, kale, mustard greens and spinach.

References

• University of Maryland Medical Center: Hypothyroidism
• Mayo Clinic: Hypothyroidism
• Mayo Clinic: Is There Any Truth to the Hypothyroidism Diet?
• Thyroid: Effects of soy protein and soybean isoflavones on thyroid function in healthy adults and hypothyroid patients: a review of the relevant literature
• Biofactors: Flavenoids and Thyroid Disease