Having an allergy to a particular food or group of foods can either be a minor annoyance or a life-threatening matter. The unfortunate issue with food allergies is that they are hardly ever realized until an allergic reaction has occurred. This can be an alarming situation for parents who do not know what is happening when their child eats something that they are unwittingly allergic to. It can be easy to keep children away from the foods that they have allergies to, but oftentimes those same food products are merely ingredients in other foods. Eating foods that contain even those food byproducts can also cause the same reaction.