Can I chew gum during ProLon®? 22 February 2022 01:30 Although we suggest no additions to the program, up to two pieces of sugar-free gum per day is allowed. Related articles If all of the food designated for one day is not eaten, can it be eaten on the next day? Is there a "transition day" diet after completing five days of ProLon®? How many calories are in ProLon ReSet? Can I switch the boxes’ order? What if food outside of the ProLon® program were eaten during a day of the diet because of circumstances (e.g., social event)?