Your thyroid needs iodine to work properly and produce enough TH for your body's needs. Don't get enough iodine, and you run the risk of hypothyroidism or a goiter (a thyroid gland that becomes enlarged to make up for the shortage of thyroid hormone). Most Americans have no problem getting enough iodine, since table salt is iodized—but if you're on a low-sodium diet (as an increasing number of Americans are for their heart health) or follow a vegan diet (more on that later), then you may need to up your intake from other sources.
It's not enough for your thyroid levels to be "normal" or fall within the reference range. In many cases, for you to lose weight with hypothyroidism, you need your thyroid levels to be "optimal." That means that your thyroid stimulating hormone (TSH) level would typically fall below 2.0, and your free T4 and free T3 would fall in the upper half of the reference range.
• Selenium: The highest concentration of selenium is found in the thyroid gland, and it’s been shown to be a necessary component of enzymes integral to thyroid function.14 Selenium is an essential trace mineral and has been shown to have a profound effect on the immune system, cognitive function, fertility in both men and women, and mortality rate.
It is extremely important that women planning to become pregnant are kept well adjusted, since hypothyroidism can affect the development of the baby. During pregnancy, thyroid hormone replacement requirements often change, so more frequent monitoring is necessary. Various medications and supplements (particularly iron) may affect the absorption of thyroid hormone; therefore, the levels may need more frequent monitoring during illness or change in medication and supplements.
Symptoms - Hypothyroidism doesn’t have any unique characteristic symptoms - all of its symptoms could potentially present as symptoms of a different illness. One way to differentiate whether your symptoms are a product of hypothyroidism is to consider whether you’ve always had the symptoms (in which case hypothyroidism in unlikely) or whether the symptom is a departure from the way you used to feel (which means hypothyroidism is more likely).
Hypothyroidism is a secondary cause of dyslipidemia, typically manifesting in elevation of low-density lipoprotein and total cholesterol levels. It is clear that treatment resulting in the normalization of the serum TSH is associated with reduction in total cholesterol levels (54), but whether total cholesterol is fully normalized by l-thyroxine monotherapy is less well-defined. An analysis of 18 studies on the effect of thyroid hormone replacement on total cholesterol levels in overt hypothyroidism showed a reduction in the total cholesterol level in all 18 studies; however, in 14 of the 18 studies, the mean post treatment total cholesterol level remained above the normal range (>200 mg/dL [>5.18 mmol/L]) (55). These findings suggest that lipid measures are not fully restored despite normalization of the serum TSH (56). Whether the degree of dyslipidemia remaining in l-thyroxine-treated patients with a normal TSH is clinically significant is unknown, given that the benefit of thyroid hormone replacement in subclinical hypothyroidism is itself controversial (57, 58).
Megan Casper, RDN, a dietitian based in New York City and the founder of Nourished Bite, points out that iodine deficiency is the leading cause of hypothyroidism worldwide. This mineral can’t be made by the body, so dietary sources like iodized salt, dairy products, seafood, seaweed, and fortified cereals are important. “Iodine is an essential nutrient in the body, and thyroid hormones are composed of iodine,” explains Rizzo. “Those lacking thyroid hormones may also be lacking iodine.”
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