Richard is a light eater. He doesn't eat much. He isn't a heavy eater. He eats a light breakfast, a light lunch, and a light dinner.
Richard is not fat. He is thin. He will always be thin, because he is a light eater. He eats a bowl of cereal for breakfast. He eats a bowl of cereal with milk.
He eats a sandwich for lunch. Sometimes it's a fish sandwich. He likes fish. He eats rice and vegetables for dinner. All he eats for dinner is rice and vegetables. Richard will never get fat.