My friends little girl is the same age and is exactly the same, She seems to be able to sense food from a mile off and eats more than me and Oliver put together lol
It could be a stimulation thing, he may have teeth coming through and the food/eating his distracting in some way. Am not sure really just a shot in the dark. You could maybe offer a bit of milk after each meal. Or maybe after each meal occupy him in some other way to signify the 'end' of that meal..maybe go for a walk or move to another room.