I’d also suggest Eat Right For Your Type by Peter D’adamo. It’s been a game-changer over the years. Since I’m an O+, the Paleo diet works for me. Interestingly, the bad foods are the ones I never really cared anyway, including peanut butter, sugars, orange juice and most fruits. I also start every day 800 ml of water. What a way to hydrate oneself!