The two most prominent dietary factors which in prone individuals invite recurring viral headaches or chronic sinus headaches are Dairy Products and Simple Sugars as a result of their weakening effect of the immune system. Dairy products in particular have a reputation of being a major cause of mucus sinus congestion, followed by Wheat products, and other mucous-forming beverage or food sources such as Chocolate, Cocoa, and Soy Products, which may have to be avoided in order to prevent the occurrence of sinus congestion and subsequent headaches... Full Text