The new spot for the Discovery Channel is a bit of a puzzler to begin with. Having previously assumed that the channel is the place to go for films about animals and nature, we must obviously have been mistaken – or were we? A sandy beach, crowded with bathers, and above their heads the number of calories per person. Well, even the hardest-headed calorie counter has as yet failed to give too much thought to the calorific value of this species. Discovery Channel, meanwhile, has already been probing our human habits.