Whippet thin Victoria Beckham is said to maintain her trim figure by sticking to a strict gluten-free diet.
Gwyneth Paltrow and Miley Cyrus are also fans of the wheat-free way which means no bread, pizza, pasta or cakes.
But a new study shows that slimmers choosing gluten-free food could be filling up on fat instead.
Eating gluten-free is a must for anyone suffering from coeliac disease but thanks to its celebrity following it has become more and more popular for people wanting to lose weight and improve their health.
Miley Cyrus is a huge advocate of the eating plan recently tweeting about the effects on her figure as she defended herself against comments that she had an eating disorder.
Miley tweeted: 'For everyone calling me anorexic, I have a gluten and lactose allergy. It's not about weight it's about health. Gluten is cr@pppp anyway!'
She also told fans: 'Everyone should try no gluten for a week. The change in your skin, physical and mental health is amazing.'
In response to demand from shoppers most British supermarkets now offer a range of gluten-free products but the new research has highlighted that these foods are often substituting gluten for fat, and can contain up to five times the amount of fat as their non gluten alternatives.
A Love Life wheat-free loaf at Waitrose contains three grams of fat, Marks & Spencer's wheat-free bread contains almost three times more fat than the regular version and Sainsbury's FreeFrom pitta bread has almost five times as much fat as the store's standard pitta bread.
Food expert Tanya Thomas of the British Dietetic Association said: 'People assume that by cutting out gluten they are going to lose weight, it's a myth.'
And Sarah Sleet, chief executive of Coeliac UK, which represents people with a wheat allergies, admits that the industry has a problem with higher fat in gluten-free bread and bakery products.
She said: 'Undoubtedly there has been a rise n diagnoses of coeliac disease, but it can't explain the explosion in gluten-free products.
'Many people are choosing to go gluten-free because they simply want to reduce their wheat intake.'
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