Ask Dr. K: A little about iodine and your thyroid gland

DEAR DOCTOR K: Recently I’ve been feeling sad and tired. My doctor doesn’t think I’m depressed, but I know something’s not right. What could it be?

DEAR READER: Doctors typically define diseases by how they appear in their most extreme form. I call it the “tip of the iceberg” phenomenon. For example, you don’t have diabetes until your blood sugar reaches a certain level. You don’t have lupus unti