Allergy Symptoms

If you are allergic to a certain food, but eat it anyway, there are some proteins, which affects the body's immune system. The body forms a allergy antibody, which attack the proteins from the food that you are allergic to. When this happens, the body will react with the allergic reaction.
It can be:
The eyes itch and turn red
Your nose itches, runs or is stopped and you sneeze
Symptoms of asthma with coughing, whining and wheezing, chest tightness and shortness of breath
Rash on skin with itchy, white or pale red puffiness
Abdominal pain, nausea, vomiting and diarrhea
You will usually get two or more of the symptoms. In rare cases you can get allergic shock, which is a dangerous allergic reaction with symptoms from the whole body.

It is different, how much we need of the food you are allergic to, before you get symptoms. But sometimes, there is very little to.