Iodine is an essential building block for thyroid hormones (T3 and T4), which act as the body’s master metabolic regulator, controlling energy conversion, body temperature and heart rate. No other element can substitute for it in this function. Inadequate iodine intake can lead to hypothyroidism, goiter, fatigue, weight gain and cognitive issues like brain fog. During pregnancy, it poses a severe risk of impaired brain development and physical retardation in the fetus. The fortification of table salt, starting in the 1920s, virtually eliminated endemic goiter. However, modern dietary shifts away from iodized salt risk a resurgence of deficiency. Primary sources…

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