In relation to an athletic event, when is the optimal time to consume fiber-rich foods? Multiple choice question. Consume fiber-rich foods in the pre-event meal to promote satiety and bowel regularity. Consume fiber-rich foods 1 day prior to the event to help empty the colon, but do not eat high-fiber foods the night before or morning of the event. Consume fiber-rich foods 2 days prior to the event to help empty the colon, but do not eat fiber-rich foods for the entire day prior to the event