A new study finds that "the ritual of singing before eating a slice of cake, or any other dessert, increases one's appreciation of the treat. The result is that the food ends up tasting better, at least in our minds."
It's actually the ritual of singing and not the song, thankfully for those around me who have to listen to me try to carry a tune. The study also found that any personal ritual will enhance your enjoyment of food.
This is why I ritually slaughter a chicken before every meal. Oh. Wait.