Maybe he's spent too much time in America. I hear stories about exchange students coming to America from Europe, and they return much heavier because of the sweeter and tastier food we have here. I imagine he'd splurge a bit on special occasions with guests. Obviously he's not overweight. I knew a priest who is quite thin, who would eat an almost scandalizing amount at a restaurant with friends, but he quite likely fasted to a great extent during the week. It's good to relax on occasion; a spring can get weak if always stretched.