Two men confront their lifelong eating problems in the feeding clinic. A former jockey obsessed with keeping his weight down swaps diets with a man whose booze-binging is out of control.

In Los Angeles, Anna Richardson discovers that a fascination with celebrity mums lies behind the dangerous trend of extreme post-baby weight-loss regimes. She meets the Hollywood housewife who won't leave her Beverly Hills mansion until she's lost her pregnancy weight, and joins in an exercise class where babies are used as dumb-bells.

The Flab Fighters descend on Cardiff's Millennium Stadium for another lesson in how to enjoy their favourite treats and still lose weight. Will they be tempted by a tub of ice cream after a marathon session of step-running?