Can I switch the boxes’ order? 22 February 2022 07:13 No, you should not switch the boxes' order, as each day of ProLon has a precise caloric and nutritional balance. Related articles Can I replace a food or ingredient with another? Is tea, coffee or infusion allowed during ProLon? Is it possible to switch the lunch meal with the dinner meal? Can I chew gum during ProLon®? Can I extend the fast?