These are really good articles about allergies and sinus infections. At DAATC which is based in Dublin, Ireland we believe that sinus problems are very often related to food allergies. Once we have identified the foods causing the problem an exclusion diet can work wonders.
By Denise DeWitt
http://www.empowher.com/allergies/content/runny-nose-allergies-cold-or-sinus-infection?page=0,1