Carol Vorderman?s detox: Cuts out caffeine, booze, meat and dairy products, and favours raw fruit and vegetables as well as lots of nuts and seeds. Ask Kim Wilde.

Glycemic Index (GI) diet: Followed by Kylie Minogue. Processed foods and carbs are off-limits, but the diet allows red wine and dark chocolate.

Blood type diet: Followed by Martine McCutcheon. Did you know that Os are ?hunters? best suited to a meat-heavy diet, while As should be largely vegetarian?

Food combining: A favourite of Liz Hurley. The basic principle of this diet is that you do not mix food types. For instance you avoid eating carbs and proteins together. And have fruits separately.

Weight Watchers: Bit of an oldie but still in use (Fran Drescher and Kate Winslet are on it). Foods are assigned point values based on their number of calories, grams of fat, and grams of fibre. Eat anything you want, but stay inside your daily point limit.