Anything that requires more work from the body beyond homeostasis is going to require more food.  That includes growth spurts and recovering from severe illness or injuries.  Healthy adults sitting on their butts don't require nearly as many calories.  This is why I hate fats arguing that thin people are eating the same amount as a child.  Proportionally, children require a lot more calories because they're actively growing.  If you scale up the number to an adult, guess what?  You'll see growth again, just not in the upwards direction.