In the fifth episode, the programme examines portion sizes. Over the last 25 years portions have increased by 100 per cent, as well as plate sizes. Dr Ranj checks out a breakfast buffet to see whether we really know how many calories we're piling on our plates, while Sian looks at off-the-shelf portion control gadgets, including miniature cutlery to make us eat more slowly.And two more dieters are nearing the end of their 28-day value for money trial as two more diets are put through their paces £ for lb. This week, The Metabolism Reset Diet, which claims that a detox for the liver can also help you lose weight, and Bosh! Healthy Vegan, which means ditching junk food and cooking from scratch, go under the microscope. With an enormous weight loss for one dieter, how will these two newcomers rank on the programme's leaderboard?