An allergy is a damaging immune response by the body to a substance, especially a particular food, pollen, fur, or dust, to which it has become hypersensitive.
But actually, most allergens are themselves harmless innocents. What really causes allergic reactions is your own immune system. It mistakes these innocuous allergens for a serious threat and attacks them. The symptoms of an allergy are the result of a body's misguided assault. It begins with exposure. Even if you've inhaled an allergen many times before with no trouble, at some point, for some reason, the body flags it as an invader. During this particular exposure, the immune system studies the allergen. It readies itself for the next exposure by developing antibodies, special cells designed to detect it. You are now “sensitized” to the allergen. Then, the next time you're exposed to the allergen, your immune system kicks into action. The antibodies recognize it. That triggers the activation of special cells called mast cells. These cells are responsible for allergy symptoms in the lungs, skin, and lining of the nose and intestinal tract.
Frequent eating of bananas will help those who are allergic to certain foods and who suffer in consequence from skin rashes or digestive disorders or asthma. Unlike other protein foods many of which contain an amino acid which this person cannot tolerate and which causes allergy. Bananas contain benign amino acids which in most cases are not allergic.