Andrew Huberman· PhD
So there's a condition that shows up in little pockets in the world. It's not super common, meaning it's not very widespread, but in certain areas that are far away from the ocean, at one point, this was historically in the Midwestern states of the United States, in some mountain regions of other countries, in some areas of Africa that were far from the ocean, people would get extremely swollen bulges in their necks. And this was called goiter. And the reason they were getting those swollen bulges is because the thyroid itself was hypertrophying. It was growing in an attempt to churn out more thyroid. And because it was getting a lot of stimulating hormone from the pituitary.