Counting calories is an important part of maintaining a healthy DIET. Dieting, or reducing caloric intake, is one way to achieve this goal. Dieting involves making conscious decisions about what to eat and how much to eat. Dieted is the past tense of the verb 'DIET, ' meaning to restrict one's food intake for the purpose of losing weight. HEAT is a form of energy that is measured in calories. Watching one's weight is another way to ensure that one is eating a healthy DIET and not consuming too many calories.