S1, E3: Dawn and Mike, a married couple from Hull, and their friend and lodger Gareth, want to find out why they're putting on weight. Dawn says her diet is highly regimented, and Mike doesn't think he eats any more than anyone else, while Gareth reckons for a man of 6ft 9in he's not eating more than he should. After being monitored both inside and outside their home, will the truth of what they're really eating shock them?