Great question that I don’t have a good answer for.
What I can say is that 1) all weight loss comes from burning more calories than you eat. 2) intermittent fasting alone will not cause you to lose weight unless you restrict your calories. 3) the hardest part of extended or intermittent fasting is the hunger. 4) after about 2 days of extended fasting you body switches from converting food into energy to converting stored fat to energy and your hunger disappears. That is called Ketosis. 5) you can also get into ketosis by following a low carb, high fat, moderate protein diet (LCHF or Keto) and your hunger will disappear. 6) for either intermittent or extended fasting it really helps to be in ketosis first.
BTW, The Obesity Code is a good book about weight loss, nutrition and related topics. It does mention fasting but is not the central theme. Fung’s theory is that insulin is related to weight gain and that reducing insulin spikes by not snacking between meals or even taking longer breaks between eating can reverse diabetes and help with weight loss. He backs that up with citations to tons of research. It is a good read but isn’t instructive about fasting.
It probably depends on your age, interests and gender. I’m 55F and semi retired so “Fast, Feast, Repeat” by Gin Stephens worked well for me. The author is a retired teacher.
For a younger person maybe, “The Complete Guide to Fasting” by Dr Jason Fung.
not a book, but The Fasting Method podcast is co-hosted by Megan Ramos, the woman who started the original fasting clinic with Jason Fung and still works with him today on their online community. I’ve found it engaging and helpful.
First off The Obesity Code is required reading in my opinion. However, it gives you all of the why, but not a lot of the how. Fast, Feast, Repeat by Gin Stephens gives you enough of the science to understand why, and a plan to get started. FFR is a much easier read.