Doctors Concerned about Return of Iodine Deficiency — VOA Learning English
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Beginning
A century ago, iodine deficiency affected children across much of the United States. The problem mostly disappeared during the 1900s after iodine was added to common foods. But doctors are now seeing higher iodine deficiency rates. The rises are blamed on dietary changes and new food manufacturing methods.
What is iodine?
Iodine is an element found in seawater and in some soils — mostly in coastal areas. A French chemist accidentally discovered the substance in 1811. Iodine’s name comes from a Greek word meaning violet-colored.
Later in the 1800s, scientists began to understand that people need iodine to control their metabolism and stay healthy. The element is also important for a child’s…
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