Haha.. Well it's useless to base health on some lab work...  It only shows a small part of the picture. Every parameter can give you information but you can be dying of cancer and have lovely results on your bloodworks  Your guy had diverticulitis which is rather common and slightly more prevalent in fat people but also strikes normals.  Basically, your colon develops little pouches where stuff can get stuck in and it can become inflamed. Regular bowl movements are supposed to help, preventing obstipation.  Healthy GI tract.. Drink water. Walk and move every day. Eat a diet of fiber-rich food in 3-5 small portions a day. Avoid meat or eat only in moderate quantities. Don't strain and press to hard on the toilet,  use a mild laxative if you must. Fasting a day once in a while is supposed to be quite good. Oh and go get a colonoscopy at 55. And again 10y later if everything was OK first time around