There are several synonyms that one can use instead of "watching calories" to convey the same meaning. One such synonym is "counting calories," which means keeping track of the number of calories consumed each day. Another synonym is "monitoring calories," which refers to regularly checking the calorie content of foods and drinks before consumption. "Restricting calories" is also a term that can be used to indicate an intentional reduction in calorie intake. "Calorie control" implies taking steps to manage one's calorie intake effectively. Overall, these synonyms emphasize the importance of keeping track of one's food and beverage choices to achieve and maintain a healthy lifestyle.