Yeah, I'd be hungry too. I'm 5'9 160. Here is what I eat.
2 coffees with heavy cream or just black for breakfast
6 eggs in butter and about 1/3 a pound and of bacon and veggies for lunch.
8-12 oz of meat and some veggies with a piece or two of fruit for dinner.
2-4 pieces of lindt 85% chocolate for desert with the fruit.
This is a very general pattern, but this is what I eat to maintain my weight while exercising about 2-3x/week. I also totally pig out 1-2 days a week at a sushi buffet.
Simple solution... tell him to man up and eat more meat!