While some people may choose to change their dietary standards for a variety of reasons, others want to know the calorie content of certain foods for other reasons. Maybe it's because you're training for a sporting event, you need more calories during training and competition, and you want to make sure you're getting enough energy; maybe it's because you want to be aware of which foods are high in calories so you don't overeat. In addition, after being conscious of calories, you will be more aware of the nutritional composition of high-calorie healthy foods, and will not over-intake or under-intake.
While some people may choose to change their dietary standards for a variety of reasons, others want to know the calorie content of certain foods for other reasons. Maybe it's because you're training for a sporting event, you need more calories during training and competition, and you want to make sure you're getting enough energy; maybe it's because you want to be aware of which foods are high in calories so you don't overeat. In addition, after being conscious of calories, you will be more aware of the nutritional composition of high-calorie healthy foods, and will not over-intake or under-intake.