The energy unit commonly used in the nutrition field is a calorie. One calorie is defined as the amount of energy that increases the temperature of one g of water by 1 C. Daily calorie requirement can be determined by numerical calculation of energy balance’s components. Weight loss can be achieved by either decreasing daily calorie intake or increasing calorie burn-off.
The energy in foods is obtained from carbohydrates, fats, and proteins. The energy provided by one gram of protein, fat, and carbohydrates is as follows:
It is possible to calculate when the amount of these components in the food is known. If the purpose is weight loss, the amount of energy taken must be less than the amount of energy consumed, so a diet is planned accordingly.
However, as linear growth continues in children, calorie restricting diets are not recommended for them.