Q. Do food allergies make you fat?
A. There is no evidence at all to suggest that food allergies contribute to weight gain or weight retention, says Brian Smart, M.D., an allergist with DuPage Medical Group in Glen Ellyn, Illinois. “Food allergy is related to IgE antibodies and these have no influence at all on hormones that affect weight, such as thyroid hormone, growth hormone or insulin, or on any other regulatory process that can affect overall metabolism.”