My DS's school have a late lunch (half one) so when they come home they a bit hungry but not much, they often help themselves to a snack - usually a bowl of cereal or some biscuits (they have a pack of biscuits each of their choice bought once a week and when they are gone they are gone).
They don't tend to want dinner until late because they have had lunch so lunch.
Both are growing like weeds, one is over 6 foot and the other is only about an inch behind.
What do you feed your boys? Some days they will eat very little and other days they can empty the fridge.