Apparantly the world of celebrity has seen some extreme diets but the latest craze would shock anyone who would try any diet. Its called the "Charcoal Diet", and one of the Girls Aloud singers (Sarah Harding) is a fan of it.
It claims that eating carbon gets rid of "toxins" and Miss Harding sprinkles it on food as she says it helps her to tone up.
Charcoal has in fact been used to stop the body from absorbing poisons since the 19th Century(I'm sure it wasn't used for dieting in that day as the word didn't seem to exist).
You don't eat the raw black stuff (obviously) but you can buy activated charcoal tablets from a health shop.