Radioimmunoassays for measurement of serum T3 (48) and T4 (49) were soon developed, and it was observed that l-thyroxine monotherapy could normalize both T4 and T3 levels at the expense of a high T4:T3 ratio. In contrast, l-triiodothyronine, desiccated thyroid, thyroglobulin, and l-thyroxine/l-triiodothyronine combination all typically resulted in low or low-normal serum T4 values with usually elevated serum T3 levels, and thus a low T4:T3 ratio (28). Desiccated thyroid resulted in a T3 peak about 2 to 5 hours after administration that corresponded to thyrotoxic symptoms in some patients (50). That a single daily dose of l-thyroxine resulted in stable blood levels of T4 and T3 throughout the day (48) was understood to result from a steady rate of conversion of T4 to T3 (51).
If you suffer from hypothyroidism, you should not eat them raw. Goiter is a substance that inhibits iodine uptake to create the T4 hormone. The family of crucifers are: bok choy, broccoli, Brussels’ sprouts, cabbage, cauliflower, kale, mustard greens, radishes, soy, soy milk, soy lecithin (often used as a filler in vegetarian food) and tofu. Cooking them reduces their goitrous properties, however, so they can still be an important part of a diet for thyroid health.
Two things to keep in mind: First, iron is tough for the body to absorb, but you can boost your absorption of iron-rich foods by pairing them with a source of vitamin C, Markley says. (Like tossing white beans with lemon vinaigrette, for instance.) And second, iron can make thyroid drugs less efficient. So be sure to take your thyroid meds at least four hours before or after eating an iron-rich meal .
If you have subclinical hypothyroidism, discuss treatment with your doctor. For a relatively mild increase in TSH, you probably won't benefit from thyroid hormone therapy, and treatment could even be harmful. On the other hand, for a higher TSH level, thyroid hormones may improve your cholesterol level, the pumping ability of your heart and your energy level.
“We summarized that adequate iodine nutrition of 150 mcg a day is essential for normal thyroid function but that an excessive intake—be it from a variety of sources (eg, fortified salt, supplements, seaweed, seafood)—can have the reverse effect: too much iodine can cause hypothyroidism and hyperthyroidism and too little iodine low may lead to hypothyroidism,” Dr. Leung says.
“Infants fed soy formula are at higher risk for hypothyroidism and for later development of autoimmune thyroid diseases. In humans, goiter has been seen in infants fed soy formula; this is usually reversed by changing to cow milk or iodine-supplemented diets . After the 1960s, manufacturers reportedly began adding iodine to formulas to mitigate thyroid effects.” [Doerge]
This can lead to low T3 levels (58). In addition, elevated cortisol will cause thyroid hormone receptor insensitivity meaning that even if T3 levels are high enough, they may not be able to bind normally to receptor sites. And when this happens it doesn’t get into the cells. Cortisol will also increase the production of reverse T3 (rT3), which is inactive (11).
Cruciferous vegetables, such as broccoli and cabbage, are full of fiber and other nutrients, but they may interfere with the production of thyroid hormone if you have an iodine deficiency. So if you do, it’s a good idea to limit your intake of Brussels sprouts, cabbage, cauliflower, kale, turnips, and bok choy, because research suggests digesting these vegetables may block the thyroid's ability to utilize iodine, which is essential for normal thyroid function.
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