If that’s not enough to calm your concerns, some experts suggest that eating cruciferous vegetables may actually be beneficial if you have autoimmune hypothyroidism since the thiocyanates may slow the absorption of iodine in people getting too much, which is possible if you are eating a typical Western diet of fast foods, French fries, and other processed products, that contain iodized salt, and you are heavy-handed with the salt shaker.
T4 circulates through to the liver where 60% of it is converted into T3 through the glucoronination and sulfation pathways. If the liver is sluggish it will cause a problem in T4-T3 conversion (6). Another 20% is converted into reverse T3 which is permanentely inactive. The final 20% is converted into T3 sulfate and T3 acetic acid which can then be further metabolized by healthy gut bacteria to produce more active T3 (6).
Since nutritional supplements are not regulated to the same stringent level as medications, you’ll also want to find a trusted source for any supplement you do take, so you can have some certainty of what you are getting, as you want to avoid any unnecessary or undesirable filler ingredients. For more on this read this EndocrineWeb article: Thyroid Supplements.
“The effects of fluoride on various aspects of endocrine function should be examined, particularly with respect to a possible role in the development of several diseases or mental states in the United States. Major areas of investigation include . . . thyroid disease (especially in light of decreasing iodine intake by the U.S. population).” (National Research Council, 2006)
When it comes to thyroid medications, it’s important for RDs to know the medications can interact with common nutritional supplements. Calcium supplements have the potential to interfere with proper absorption of thyroid medications, so patients must consider the timing when taking both. Studies recommend spacing calcium supplements and thyroid medications by at least four hours.21 Coffee and fiber supplements lower the absorption of thyroid medication, so patients should take them one hour apart.22 Dietitians should confirm whether clients have received and are adhering to these guidelines for optimal health.
Large predator fish—tuna, swordfish, shark, kingfish, mackerel—often have more mercury than smaller fish, as they’ve lived longer and had more time to accumulate harmful chemicals. Don’t eat more than two to three servings of these fish a week, Blum says. Also, farmed fish like salmon can have higher levels of mercury because they’re often fed the chum of other fish. All fish have a little mercury, so don’t freak out about it. Just don’t order in sushi every weeknight.
Since most cases of hypothyroidism are permanent and often progressive, it is usually necessary to treat this condition throughout one’s lifetime. Periodic monitoring of TSH levels and clinical status are necessary to ensure that the proper dose is being given, since medication doses may have to be adjusted from time to time. Optimal adjustment of thyroid hormone dosage is critical, since the body is very sensitive to even small changes in thyroid hormone levels.
Think milk, butter, cheese, and meat. If you buy the cheap, conventionally raised versions at the supermarket, those types of deliciousness can also disrupt all your thyroid’s hard work. You omnivores (like us) can avoid this dilemma by choosing organic, or at least antibiotic-free and hormone-free meats and dairy. It’ll save you in the end, with fewer medical costs down the line.
Cruciferous vegetables such as broccoli, cauliflower, and cabbage naturally release a compound called goitrin when they’re hydrolyzed, or broken down. Goitrin can interfere with the synthesis of thyroid hormones. However, this is usually a concern only when coupled with an iodine deficiency.17 Heating cruciferous vegetables denatures much or all of this potential goitrogenic effect.18
An early symptom of hypothyroidism is weight gain. Low-calorie, high-density foods such as fresh produce are the cornerstone of every successful weight loss program. Include either fresh fruits or veggies at each meal, if possible. Specific foods such as blueberries, cherries, sweet potatoes, and green peppers are also rich in antioxidants, nutrients that are known to lower risk for heart disease.
The NIH studied the link between hypothyroidism and small intestine problems. These problems included an overgrowth of bacteria, such as yeast. Probiotic supplements contain live bacteria that can help keep your stomach and intestines healthy. Besides supplement forms, fermented food and drink, such as kefir, kombucha, raw cheese, and yogurt contain useful probiotics.
The foods listed above do not contain any thiocyanate when they are in their living, intact state, because thiocyanates do not form until the plant is cut, crushed, or chewed. For example, fresh broccoli contains a harmless substance called glucosinolate, which turns into a thiocyanate called sulforaphane when the vegetable is damaged (see my broccoli blogpost for more information).
High Fiber Foods — People with hypothyroidism may have digestive difficulties, so aim for 30–40 grams of fiber daily. Not only does a high-fiber diet help with digestive health, it also improves heart health, balances blood sugar levels and supports a healthy weight by making you feel fuller. Some easy ways to increase fiber intake include eating more fresh vegetables, berries, beans, lentils and seeds.
The normal values for the serum T4:T3 ratio are seldom discussed in the literature because measurement of serum T3 levels is not a recommended outcome in hypothyroidism (1). In a large study of approximately 3800 healthy individuals (4), the serum free T4:free T3 ratio was around 3, as opposed to a ratio of 4 in more than 1800 patients who had undergone thyroidectomy and were receiving l-thyroxine monotherapy. The corresponding serum free T4:free T3 ratio in patients continuing to receive desiccated thyroid is not well-defined, but the serum total T4:T3 ratio is known to be low (28, 50). In one study, the serum total T4:total T3 was about 40 in patients receiving desiccated thyroid and about 100 in those taking l-thyroxine monotherapy (60). Of course, this is affected by the timing of blood collection in relation to the timing of l-triiodothyronine administration, which is not commonly reported. Other key factors are the well-known poor reproducibility of the serum total T3 assay (61) and the interferences with direct measurement of free T3 (5).
Caffeine has been found to block absorption of thyroid hormone replacement, says Dr. Lee. "People who were taking their thyroid medication with their morning coffee had uncontrollable thyroid levels, and we couldn't figure it out," she says. "I now have to be very careful to tell people, 'Only take your medication with water.'" You should wait at least 30 minutes after taking your medication before having a cup of joe.
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