Mineral deficiencies have become rampant in the modern world. Over the last 3000 years or so, many of the minerals have washed down into the sea. Lots of people are deficient in both iodine and zinc. Iodine is needed to make thyroid hormone and zinc is needed in order to taste properly, make stomach acid, smell, have a properly functioning hormonal system and hundreds of physiological functions.
These are just a few tidbits of information that many people are not aware of. In the 1920s through the late 1950s the medical establishment used to be excellent at diagnosing what was wrong with a person and then treating them. However, things have changed a great deal. Medicine is a big profitable business. Hospital births that used to take about 8 hours are now done in less than an hour. Headaches that used to require aspirin or medicine now sometimes require a surgical procedure.