It was Isaac Walton, of all people, who told us that virtue is its own reward. On the face of it, this is probably true - for what greater recompense is there than the warm glow of soulful satisfaction that is kindled by the knowledge that we have done the right thing? However, while virtue is highly nourishing to the soul, the body also requires sustenance of a less ethereal sort. It's a universal problem isn't it...