Biscuits prevent masturbation … really?

Manufacturers, the advertising industry and the media have long indulged our appetite for "wonder foods". Remember the one about Coke curing impotence? Or sugar as a diet aid? No?
For your benefit, then, here is a round-up of some of the most outlandish claims made over the years – a suggestion, perhaps, that today's health headlines may best be taken with a pinch of  salt.