Extended special edition of the Save Money series, which looks at value for money when it comes to the nation's most popular diets. Sian Williams and Dr Ranj get to the bottom of the true cost of some of the biggest selling diets in Britain today and find out if the pounds spent are worth the pounds lost. Which diet will be crowned the best value for money? Sian and Dr Ranj also bust some of the latest myths about sugar and reveal several shocking truths about some of the products currently on sale.