"Are some people iodine deficient?" asks Simone from Instagram. Here with our answer is Dr. Alan Christianson, naturopathic physician and author of NYT bestseller The Thyroid Reset Diet.

In his answer, Dr. Christianson explains the history of iodine deficiency and how it has evolved over the years. He identifies the groups and demographics of people who are most likely to be iodine-deficient, as well as those likely to be facing iodine excess.

For more from Dr. Christianson on thyroid health and iodine, check out his FREE series, Invisible Iodine, at invisibleiodine.com.

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