The old cliche, 'too much of anything is bad for you', comes to mind. But it's only a cliche because it's true; something that Aston Kutcher found out the hard way after he ended up in hospital following his fruitarian diet.

The star - recently panned for his turn as Steve Jobs in jOBS - explained to USA Today, "I went to the hospital, like, two days before we started shooting the movie. I was, like, doubled over in pain." He was attempting to replicate Jobs' diet, which he adopted to help battle the pancreatic cancer that eventually took his life. "First of all, the fruitarian diet can lead to, like, severe issues," said Kutcher, who could acclimatise himself to the eating pattern without pancreatic issues of his own.

So why, then, is it such a bad idea to eat something generally considered healthy? Unlike the Notting Hill version of fruitarianism in which carrots are 'murdered', the diet Kutcher was following was eating just fruit and nothing else. Gaynor Bussell, a spokesman for the British Dietetic Association has the answers. "It's virtually impossible to get all the nutrients you need," explained Bussell. "You would miss out on essential fatty acids. One of the big ones is B12, and you can get some sort of anaemia if you don't get enough. And deficiencies in calcium, protein and iron would lead to tiredness and lethargy. You would be prone to osteoporosis. The immune function would probably be quite low. We have to have things from all the different food groups for a reason."