In the feeding clinic, supersize Amy Green, who tips the scales at a staggering twenty-stone plus, swaps with superskinny Ami Walsh, who only weighs seven stone ten .

Twenty-one-year old comfort eater Amy gorges on enough food for three women and is terrified that she's going to pass on her poor eating habits to her baby daughter.

Meanwhile 18-year-old Ami is always too busy to eat, and her poor diet has left her lacking in energy and confidence. It's an emotional week for both women, who are desperate to turn their eating habits around.

Also, throughout this series, the show follows the ongoing story of women with eating disorders. This time, dietician Ursula Philpot urges the group to face their fear of foods head on in the supermarket.