Sabrina meets teaching assistant Hayley from Eastbourne, a chocolate fan with a busy lifestyle, and takeaway fan Rinia from Surrey

Karl from Essex is puzzled about why he's never gained weight. And does Gaby from south London's digestive system hold the secret to her shape?

James struggles to put on weight, in spite of what he eats. Sabrina also meets Margaret and looks for tips on staying slim in her routine.

Sabrina meets busy teacher Kirk, and Ria, whose food choices don't seem to impact her body size.