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Synthroid is the name brand for levothyroxine sodium, a medication used for low thyroid function, or hypothyroidism. It may also be used to prevent the occurrence of goiters. It is well-tolerated by most individuals since the body produces the natural version of this hormone, but there are foods and medications that interfere with Synthroid and thyroid function in general.

Taking Synthroid

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It is critical that you take Synthroid at least 30 minutes to an hour before eating, according to Synthroid's official website. In fact, the company recommends you take the pill in the exact dosage prescribed by your doctor with a full glass of water to ensure the best absorption.

Brassica Family Vegetables

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According to Women to Women's website broccoli, cauliflower, cabbage, Brussels sprouts and rutabaga can interfere with the thyroid hormone. In turn, Synthroid absorption may also be critically affected when these foods are eaten regularly. According to David Williams, M.D., a clinician and researcher, the raw form of these vegetables poses the most detriment to the thyroid.

Soy

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Those with thyroid issues and who take Synthroid should avoid soy and soybean products, according to the U.S. Army Medical Department. Soy foods are goitrogenic, meaning they suppress thyroid hormones. If you are using Synthroid it is important to remember that soy can affect its absorption.

Dietary Fiber

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Too much fiber in your diet means that Synthroid may not be absorbed as effectively and the levels in your body are decreased. The National Institutes of Health states that excess fiber impairs absorption of this synthetic medicine. Fiber is only found in plants, so nuts, legumes, fruits, vegetables and grains contain it. Some very high fiber foods include whole wheat bread and cooked black beans or lentils.

Other Foods

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