During a flare, it's best to avoid all carbonated drinks, which often cause gas. You should also avoid other gassy foods, such as beans, cabbage, and broccoli.
Cut back on caffeine, too, to curb gas when flaring. Skip greasy and fried foods, which can cause gas or diarrhea.
High-fiber foods such as raw vegetables or fruits may be a problem during a flare, so cook them well. Smaller meals can also ease symptoms.