Iodine deficiency. My sister just told me that her health expert told her that most people in America are?

deficient in Iodine. Eh? Maybe in the 1920s but isn't that what Iodized salt is all about? So her health expert recommended she start using natural sea salt (Redmond's to be exact) and stop using ordinary salt. Eh? If she is iodine deficient why is she going to stop using iodized salt? Eh?