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IVE human guinea pigs have accepted an invitation to Britain’s first fast fix clinic, hoping to reverse their diagnosis of Type 2 diabetes. The nation is in the grip of a £10 billion health crisis, with the disease bringing the NHS to its knees, but this can be changed by ditching bad habits.

A bit like a fat farm reality show, but with a serious message, this sees the patients take on a radical liquid diet of just 800 calories a day for four weeks.

It’s all monitored by GP and obesity expert Dr Zoe Williams and Professor Jason Gill, a researcher into how diet and exercise can prevent diabetes, while Anita Rani hosts.

There are nerves as the five dieters check in to the clinic and are weighed.

Steve, 55, at 12 stone 9lbs is told that he has a double risk of heart attack in the next 10 years. “I still haven’t got my head around the seriousness of it,” he says.

Meanwhile, Tracey, 48 and 15 stone 3lbs, is a self-confessed comfort eater.

Jeana, 29, and 14 stone 6lbs is horrified by the results, while Dan, 41 and 14 stone 4lbs decides: “I need to use that worry to motivate change. Don’t just worry and eat cake.”

Weighing in as the heaviest patient is Luke, 32, who at 20 stone 3lbs is in the ‘critical zone’.

He says: “I’d be lying if I didn’t say I was partial to a burger. I’m like a trash can basically. I’ll eat anything and everything.”

Also hoping to trim their waistlines and avoid becoming diabetic are chef Rosemary Schraeger and Paul Sinha from The Chase.

Can they ‘fast themselves better’?