What are discretionary calories? a: the difference between the number of calories needed daily and the number eaten that day to fulfill nutritional requirementsb: the difference between the recommended daily number of calories and the actual calories consumed on food items that are not in a food group on the food platec: the recommended number of calories minus the actual calories consumed from the food groups on the food plated: the recommended number of calories a person should consume daily from the food groups on the food plate