Siblings Jill Hamill and Stuart Raphel from the Wirral are in the spotlight. Both are desperate to lose weight, but convinced they don't eat enough. What will the five-day around-the-clock surveillance reveal?

The Castle family from Welwyn Garden City are mystified - how can they be putting on weight when they eat mostly healthy, home-cooked food? Using surveillance from cameras in their home, plus private investigators following them outside the house, the Castles are shown what they're really eating.

This week, Dawn and Mike, a married couple from Hull and their best friend and lodger, Gareth, want to solve the riddle of why they're putting on weight.

The Meakin family are under the spotlight this week. Mum Sue, daughter Natalie, and son Dave are all needing help to solve the riddle of why they're putting on weight.

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Engaged couple Ronnie Derrett and Stuart Ellaway from Farnborough want to solve the riddle of why they're putting on weight.