This is fine until you get serious about the exercise. Which happens very gradually. Then you’ll find that you easily “bonk” during high-intensity long workouts

This is fine until you get serious about the exercise. Which happens very gradually. Then you’ll find that you easily “bonk” during high-intensity long workouts having exhausted your internal glycogen reserves. At this point (and I’m here) you have to figure out how to supply your body with sufficient calories balanced in a way that’s supportive of your development without gaining weight. I am yet to figure this out. Eating 4000 kcal of balanced food given the limitations our boys has in terms of glucose and protein absorption isn’t easy and my body appears to be especially reluctant to replenish liver glycogen instead of storing fat.