AUSTRALIA: Former Biggest Loser contestant Andrew ‘Cosi’ Costello reveals the truth about the weight loss show.

Have you ever wondered how the contestants manage to lose a staggering 12 kilos in a single week? We don’t. In my series a weekly weigh-in was NEVER filmed after just one week of working out. In fact the longest gap from one weigh-in to the next was three and a half weeks. That’s 25 days between weigh-ins, not seven. That “week” I lost more than nine kilos. I had to stand on the scales and was asked to say the line, “wow, it’s a great result, I’ve worked really hard this week”. The producers made sure that we never gave this secret away, because if we did, it created a nightmare for them in the editing suite. The shortest gap from weigh-in to weigh-in during our series was 16 days. That’s a fact. The thing is, overweight people get inspired by watching the Biggest Loser. They get off the couch and they hit the gym. But after a week in the real world, some people might only lose 1kg so they feel like they’ve failed and they give up. . . .

I would say that about 75 per cent of the contestants from my series in 2008 are back to their starting weight. About 25 per cent had had gastric banding or surgery. I sit in the middle somewhere.