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A food allergy is defined as the human body’s atypical response to a particular food because of a reaction by the body’s immune system. More specifically, it is an overreaction to the proteins found inside of a particular food. The reaction typically occurs soon after ingesting the item and the allergic response can range from mildly unpleasant to very dangerous, depending on the person and the amount consumed. Worldwide to date, there are several leading foods that cause the most allergic responses in humans. 

Cow’s milk 

Animal milk has many different proteins within its composition. Because of this, a milk allergy is defined as an immune reaction to any one of them. Most commonly, it’s caused by an adverse reaction to the alpha S1-casein protein. When people say they are Lactose intolerant, however, it does not mean they are allergic. it means they are missing the digestive enzyme, lactase that is needed to digest lactose, a milk sugar. 


Egg allergies occur when the body’s immune system overreacts to proteins in either the egg whites or the yolks, if not both. The immune system sees the proteins as a foreign invader and sends out a response to protect the body against the perceived attack. 

Tree Nuts

A tree nut allergy is not the same thing as a peanut allergy. Tree nuts are technically fruits of a tree. Some examples include water chestnuts, hazelnuts, almonds, brazil nuts, pistachios, pecans, and walnuts. Contrarily, peanuts are considered a legume and they grow underground. 


A peanut allergy is one of the most common causes of the more severe types of allergy attacks. There is a huge spectrum of reactions and their severity, from a runny nose to stomach cramps or a rash. Some people go into anaphylactic shock, which means their immune system releases a flood of chemicals very quickly, causing blood pressure to drop and airways to narrow. Breathing is affected almost immediately. 


Contrary to popular belief, wheat allergies are not the same thing as having Celiac disease. In cases of immune system overactivity, such as with Celiac disease, the body attacks and damages itself. A wheat allergy is an immune response to gluten, a protein found in wheat, rye, and barley.