From Madonna's quest to "neutralize radiation" to Tom Cruise's dismissals of psychiatry, celebrities are seldom shy about expressing their views on health and science — even when they appear not to know what they're talking about.
A roll call of public figures have offered bogus advice or "quackery" this year, according to scientists and doctors. The charity Sense About Science is concerned that celebrities mislead the public when they endorse theories, diets or health products while misrepresenting the science involved.
Some — such as Oprah Winfrey and Kate Moss — espouse "detox" regimes, while others, such as Sharon and Kelly Osbourne, believe (mistakenly) that the Pill can cause cancer.
Demi Moore, the actress, surprises the experts with her use of "highly trained medical leeches" to "detoxify" her blood.
Kate Moss, the model, is reported to be on a strict "detox" diet of fruit and vegetables at a health spa in Thailand. But nutritionists note that such regimes exclude important food groups such as protein.
Moss's friend Stella McCartney, the designer, was criticized last year for saying that a chemical found in skin creams was also found in antifreeze. Gary Moss, a pharmacologist, said that the chemical, propylene glycol, was versatile and its use in cosmetics was not "scary", as claimed.