Sugar junkie Danni Brooke swaps with 21-year-old Vicki Smith from Glasgow. It's a highly emotional week in the feeding clinic for 29-year-old Danni Brooke from Lincolnshire. Danni's constant gorging on cakes and snacks has left her a staggering twenty-four stone five. Food-phobic Vicki Smith's picky eating habits have reduced her to a lightweight six stone four. Swapping diets brings extreme emotions to the surface as Danni opens up to Vicki about a foodie secret from her childhood. Dr Christian shocks Vicki with a superskinny gallery designed to highlight the potential dangers of her appalling diet, while Danni breaks down as she gets a wake-up call from America. Eating disorder dietician Ursula Philpot takes the remaining two members of her group to a spa to try and reverse their feelings of low self-esteem.

• Liza Tarbuck
• Anna Ryder Richardson
• Gillian McKeith