It is important to have moderation in your diet because you need a balanced diet, like eating burgers, fries, candies, and other sweets aren't good to eat so much. So you should have a balanced diet like eating healthy foods but its ok if you have those unhealthy foods.
Moderation means not eating to the extremes, neither too much nor too little.
Explanation:
Calorie control is necessary so that the amount of energy you get from the nutrients you consume equals the amount of energy you expend during your day's activities.