A person will never know if they are allergic to a certain type of food unless they have eaten the food allergen itself. It takes a certain amount of food for the reaction to take place and trigger a symptom.
Allergy is one of the most common diseases existing in society today. There are millions of people suffering from allergies and about 6 percent of the population suffering from allergy is children and infants. You have to consider that this kind of disease can affect anyone at anytime. Once your immune system overreacts to a foreign object that is usually harmless and releases histamines, allergy symptoms can occur.