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So, in short, this book is all about how I combine ketosis and intermittent fasting to stay lean year-round.
Ketosis, for those who don't know, is the physiological state where the body primarily burns fatty acids and ketones for energy. By default, the body burns glucose (primarily and in a large proportion) for energy metabolism.
So, shifting the metabolism to a fat burning state is not easy, and in the case of wanting to reach ketosis, it requires sustained severe carbohydrate restriction. So, to reach ketosis you'd have to constantly restrict carbohydrate intake to less than 50 grams per day.
And, as I discuss it in the book, I combine this with intermittent fasting, which is simply a method for changing the frequency of how you eat (it doesn't have anything to do with the quantity). One of the simplest IF protocol that I discuss in the book is 16/8, in which I restrict all my food intake to an hour window.
Anyhow, grab the book if you're interested about this stuff...
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Cristi Vlad Self-Experimenter and Author