Hypothyroidism Type 2 is based on a lot of research, even though it's not mainstream. Some people just have a lot of symptoms of hypothyroidism, which doesn't show up on blood tests, but that happily goes away when treated with thyroid medication ...
The idea of "type 1" and "type 2" is from diabetes. In type 1 diabetes, the body doesn't produce enough insulin. In type 2, it does, but the body can't absorb it properly. Starr argues that it's the same with the thyroid. If the thyroid doesn't produce enough hormones, it shows up on blood tests, and you can get treated. This is the widely recognised form of hypothyroidism. If the thyroid produces enough hormones, but the body can't absorb it, it won't show up as a hormone deficiency in a blood test, and 99% of doctors won't recognise it as a problem, even if you as a patient have clear symptoms of hypothyroidism.
I've had symptoms of hypothyroidism since I was maybe nine years old. When I read an article in a magazine and recognised the symptoms, I got a blood test - "normal". A few years later, a holistic healthcare practitioner diagnosed me as hypothyroid. I've been tested since, and blood tests always come back as normal, yet my symptoms remain. I later came across a newspaper article mentioning a "type 2" - a hypothyroidism that you can't find through blood tests. Wanting to learn more, I came across this book, and gobbled it up.
As a book, while the medical talk gets a bit heavy at times, it's still perfectly readable and understandable to non-medical people. There's a lot of research behind this, dating back about a century, and it's very fascinating to read about. Very enlightening.
What do you say to a doctor who won't listen when you say you have an underactive thyroid? (Mine sure didn't.) That's why everyone who suspects they have an underactive thyroid because their symptoms say so, even if their blood tests don't, should not only read this book but read up about the subject as much as possible and try to turn the tide. Find out all you can, and from that, try to do what you can to help yourself.