Aperson who has allergies has a compromised immune system because the body's immune system.
attacks its healthy cells.
overreacts to an antigen.
steals nutrients from healthy cells
responds to wait

A person who has allergies has them because his or her body over reacts to a material that would otherwise be ignored. It is an overreaction of the immune system triggering a immune attack response that is unneeded. For instance, A person with a peanut allergy has a body whose immune system flags the peanut protein as an intruder and attacks it. It produces antibodies and causes growning reactions that can be life threatening and cause anaphylaxis.