In many respects GDD is much easier to understand than NSF, as it essentially follows the pattern of an allergic reaction, except that it is cell-based and not principally antibody based. Acute hypersensitivity reaction (AHR) is as straightforward as GDD, it is primarily direct Mast cell activation. Example: a number of people have an allergic reaction to peanuts, much rarer is an allergic reaction to walnuts, same true comparing strawberries and blueberries. A major differen