The slim people in this episode are teaching assistant and mum-of-three Hayley from Eastbourne, who's an unashamed chocaholic with a busy lifestyle, and Rinia from Surrey, who wonders why she manages to stay in shape in spite of her takeaway diet.
Karl from Essex is puzzled about why he's never gained weight. Sabrina also meets Gaby from south London. Could her digestive system hold the secret to her keeping trim?