I have this problem as well, however I can open the book. I definitely have enough RAM allocated. If anything, I have too much allocated. I tried tweaking the hunger overhaul and the spice of life config files. Regardless of the values I change on variables that should affect eating speed, nothing will change in-game. That being said, I can't eat... not apples, not the emergency rations that I ask for. I really like the concept of these mods and don't really want to delete them.