Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Gluten Sensitivity ?
    ### Response:
    Gluten is a protein found in wheat, rye, and barley. It is found mainly in foods but may also be in other products like medicines, vitamins, and supplements. People with gluten sensitivity have problems with gluten. It is different from celiac disease, an immune disease in which people can't eat gluten because it will damage their small intestine.
    