The association between hypothyroidism and energy expenditure was suspected clinically, and the discovery of lower O2 consumption in myxedema provided an early diagnostic tool (19). The development of a device to assess energy expenditure through measurement of the basal metabolic rate (BMR) in humans proved to be useful for not only diagnosis but also titration of therapy (20). The scale was calibrated so that a normal BMR reference range would be around 0%, whereas athyreotic individuals could have a BMR of about −40% (21). Because of lack of specificity (for example, low BMR in malnutrition), BMR was used in conjunction with the overall clinical impression; a low BMR in the setting of high clinical suspicion would secure a diagnosis and justify treatment (21, 22).
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).
People with celiac disease—the autoimmune disease that's characterized by an intolerance to the gluten in wheat, barley, and rye—are also more likely to have higher rates of thyroid problems, according to a 2007 report by researchers in the United Kingdom. "Eating a gluten-free diet helps control the symptoms, which may also help protect the thyroid gland," says Ilic. But unless you have celiac disease—and we're not talking an L.A.-aversion to gluten, here — you might not want to avoid breads after all. In fact, thanks to some of the baking processes, bread can actually contain some iodine.
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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