Diet Cherry 7 Up: Diet Cherry 7 Up has recently been reintroduced due to popular demand after having been missing due to the existence of 7 Up Plus Cherry flavor.[26] Ingredients are: filtered carbonated water and contains 2% or less of each of the following: citric acid, natural and artificial flavors, potassium benzoate (protects flavor), aspartame, potassium citrate, acesulfame potassium, red 40. Phenylketonurics: Contains phenylalanine.[27]