A great book as well is The Hungry Brain by Stephan J. Guyenet. It looks at the neurology of eating, overweight and obesity, and there is a ton there. Basically, most of the popular theories (insulin, microbiome, willpower, sugar, etc.) are only a tiny bit right, and the truth is predictably holistic, mostly driven by things that are not acting under conscious control. There are of very interesting studies covered in that book.