Martin and Christine

Swapping diets are 18-year-old superskinny Georgetta, who under-eats to look good but at a cost to her model looks. She will be paired with 28-stone supersizer Ameer, who is determined to lose weight so he can find a girlfriend.

Anna Richardson's Flab Fighters are four weeks into their battle of the bulge, and this epsiode embark on a calorie-burning rowing trip. But will they choose to have their cake and eat it?

There's also an update on the progress of four young women suffering from anorexia nervosa, where a shopping trip reveals the devastating physical affects of their body dysmorphia. Dietician Ursula Philpot then confronts the four young women's food anxieties by getting them to eat a highly calorific sandwich.