Energy cost of growth is one of the most important components of Energy Requirements (ER) for children and adolescents. According to the latest research: ER was calculated as adding another 8.6 kJ (2 kcal) for each gram of weight gain during growth. In the 2004 FAO/WHO/UNU report on human energy requirements, which used the data from doubly labeled water (DLW) and heart rate monitoring (HRM) method, proposed the latest daily energy requirements for children and adolescents (1-18 years of age). This article introduces the advances in recent years on the energy requirements of children and adolescents.