Restricted diet makes dinner parties awkward to attend

DEAR ABBY: I have multiple chronic health conditions. Because my symptoms are worsened by a lot of foods, I’m on a highly restricted diet. If I stay on it, I feel as well as possible. (I never feel entirely well.)

When I go to friends’ homes for dinner or parties, would it be rude for me to bring along something for myself that I can eat that won’t make me sick? I can have no grains, no dairy, no e…