The Obesity Code is a good primer on weight loss being a hormonal imbalance rather than caloric imbalance, the things that cause this imbalance and how to resol

The Obesity Code is a good primer on weight loss being a hormonal imbalance rather than caloric imbalance, the things that cause this imbalance and how to resolve it. Fasting is a chapter that he expands upon in The Complete Guide to Intermittent Fasting ("CGIF") My first reaction to your statement about it being "just marketing material for some fitness coach" was "that's absurd" but then as I reflected a bit more I can see how some people may have taken it to be him trying to pitch his clinic in Toronto, but I don't think this is the right interpretation. He is a practicing nephrologist who refers in his book (like many books written by doctors) to many case studies. I didn't at any point think "Gee, I should fly to Toronto and get into this program" but rather thought the case studies lent some context to his claims. I suggest reading the book and forming your own opinion. I was fasting before I read the book, but the book helped me understand some of the science, pitfalls, and protocols.