<<Disclaimer: Verify this information before applying it to your situation.>> I had quite a few responses to my question as what the difference is between allergy and sensitivity. I will sum it up. Allergy or food intolerance: you have symptoms, they are quick-acting, it is a histamine reaction, causes no damage and can be reversed. IgE. Sensitivity: symptoms are same or similar - body produces anti- bodies - damage can occur because body attacks itself. You cannot grow out of it, it does not change. IgA or IgG. Thank you all for helping me out. Doris