Need book for Dummies on the "Gut"

[MamaOnAMission]

I think the reason she's not getting better and flips out on "EVERYTHING" we try is her "GUT" being so damaged!!! Plus severe constipation from all the toxins being stuck inside her. Explains why I never see her look well. I'm putting everything into this gut healing and bought some books that seem a bit confusing for my pea brain. I need something very simple to start with. I'm working with Scott S. on this who is brilliant with this! I'm excited and am getting closer and closer to putting all pieces together. Phew!