Glee star Matthew Morrison has revealed that he was so worried about stripping off for a magazine cover that he ate nothing but sweet potatoes before the shoot.
The US actor, who plays Glee club coach Will Schuester in the hit show, said he followed the bizarre sweet potato-only diet for three days before the photo-shoot for Details magazine.
Speaking to UK newspaper, the Sunday Mirror, he said: 'I had to have a six-pack on show. My trainer said to eat nothing apart from sweet potato and very little water.
'The potato acts as a sponge and your body literally shrinks and gets ripped and tight. Afterwards, I ordered two pizzas and pasta!'