With the summer holidays looming, Ruth Langsford investigates which diets work best if you want to lose weight fast. Under the supervision of Doctor Amir Khan 12 overweight food lovers go on some of the most extreme diets out there. Can they drop one stone, in one month, in time for the summer?

Every episode of this 3×60 series features four food lovers, as they each keep a ‘bad food diary’ to reveal the hard truth about their eating excesses, before Ruth and the team give them an extreme weight loss plan to undertake. But will they rise to the challenge?

At home, Ruth candidly reveals the pressure she feels to keep her weight down. Amidst heroic attempts to squeeze into her favourite clothes, she confesses to the same dietary downfalls as the rest of us – whether it’s wine o’clock or her calorific hangover cure; her secret snack cupboard and the fat-laden foods she cannot resist.