"Dietetic beverage" refers to a type of beverage that has been designed to be low in calories and sugar to promote a healthier lifestyle. However, if you're looking for synonyms for this phrase, there are a few to choose from. One of the most common is "low-calorie beverage," which simply refers to a beverage that contains fewer calories than other alternatives. Other synonyms include "light beverages," "reduced-calorie drinks," and "sugar-free beverages." All of these terms emphasize the health benefits of the beverage and are particularly popular among those who are looking to maintain a healthy, well-balanced diet.