Not a book, but I watched Fat Head (think you can see it online), a documentary sort of in response to Super Size Me and looking at low carb high fat diets and touches on general conceptions of diet, healthiness and even on the cultural disparities/prejudices that we overlay with that. Found it really interesting and found it I was intrigued about LCHF/Keto etc type diets.
I’ve been eating LCHF for a little while now, about 7 months, it’s a new way of eating to me, not a temporary diet change, and it’s been great, and really helped me with moving past emotional eating and overeating.
I also found this blog helpful - I didn’t follow the recommendations to the letter (some of it did feel a bit too hippy for me 
something the author references), however the thought processes around food I found helpful. Eg why did I eat like that, what led up to that, as well as letting in to what you truly want to eat instead of what you tell yourself. I had this issue, eg I’m treating myself to dessert and I fancy this strawberry tart, only, chocolate is usually my favourite, so I’m getting this chocolate cake even though it’s too rich for me right now, because in my head, I can’t eat two desserts and don’t want to miss out on the chocolate even thought what I fancy is the strawberry. That was the kind of thought process I had which was quite unhealthy really! And led to me making poor choices about food, which made me unhappy or overeat. Once I started thinking more consciously about my eating following that blog, it actually helped a lot.