DEAR DR. BLONZ: I have celiac disease, so I’m well aware that food can harm you, but I get a lot of unsolicited advice. I hear that sugar feeds inflammation and that dairy products make our bodies produce excess mucus. When there is an infection, such as bronchitis, the mucus layer can become inflamed, increasing mucus production. This excess mucus can collect, and the body works to clear it out by coughing. Assuming, of course, that there is no milk allergy present, what gets produced in our throats after consuming dairy is not the same as increased mucus production in the lungs.