@Craig Evans Thank you for the clarification. Of course, I understand that it depends on many different factors and that everything needs to be tested and adjusted accordingly. However, if we focus on a daily intake of 3,000 kcal, what would the ideal macronutrient distribution be for a 50 kg child? I assume the carbohydrate intake should be around 50–60% of total calories, but what about protein and fat? For physically active children, would a protein intake of 1.8–2.0 g per kilogram of body weight be appropriate, with the remaining calories coming from fat? Thank you very much for your excellent answer. I would also be very interested in learning how daily calorie requirements are calculated for children.