1.4 The science bit
It is very important that the body has a defence mechanism against allergens (what causes an allergic reaction). It is a way of protecting us from harmful substances that regularly bombard the body. But the body produces antibodies to safely dispose of these harmful substances. This is the body’s natural immune response.
Normally, this response would occur and not cause such symptoms. All you need to do is either avoid that food or have it in small amounts. With a food allergy, often you cannot have that food again because it causes a severe reaction.