avoid gluten... if you are one of the people that have an autoimmune reaction to it, it will begin to destroy your gut causing malabsorption and an increased immune response (since your gut will have small "openings" in it - allowing proteins to escape into the blood) which will make you feel like shit as well
here, read this
http://www.precisionnutrition.com/fix-gut-fix-health
something else that maybe useful
http://glutenfreeworks.com/blog/2011...rohns-disease/