I read the book (judging by your low-effort snark, you did not) and found it quite useful.

For those that like to read, the book has quite a few ways to reduce and change your hygiene regimen and figure out if you're having reactions to certain products. A bit dry, but definitely made me want to switch to soaps/shampoos/etc with minimal scents and additives.

Iatrogenics is a term when a treatment causes more harm than good, and often because people want to do “something” you end up in a state where you’re using all manner of things that might be bad for your health.

I don’t see what’s wrong with a “product elimination diet” at all.

> Surely you perceive how full of shit that sounds.

It's no different than when you have issues with food:

> An elimination diet involves removing foods from your diet that you suspect your body can’t tolerate well. The foods are later reintroduced, one at a time, while you look for symptoms that show a reaction.

* https://www.healthline.com/nutrition/elimination-diet

You either 'go to zero' and start introducing one new element/variable at a time to see what is causing you issues, or you start at the status quo and remove one variable at a time. It's a controlled 'experiment' on yourself.

And given that she has a private practice, lectures at the University of Toronto, and is associated with a major hospital (which a Level 1 trauma centre), she's hardly some quack.

I think this is an attempt at humor.