Tiffiny Hall waits to discover her weight gain after a week spent with her TBL family. Source: Channel 10

“We never used plates and we never used bowls. They had no portion control, they served all their food on shared platters, so they had no idea of the amount they were consuming,” she said.

“I couldn’t sleep, my mood was low, I was like, ‘this is a nightmare’.”

Hall returns to Channel 10s weight-loss show this season and spent a week with her Biggest Loser family, adopting their unhealthy lifestyle and eating everything they ate at home.

She coaches the loud and loveable Hailwood clan (white team) from Western Australia. But, after just a few days dining with the family of four, Hall says she was so bloated she looked like she was four months pregnant, and her skin had broken out in a “rash of acne”.

Here’s what the Hailwoods served up to Hall, who was also not allowed to do any exercise, during her homestay:

Lunch: Chicken wings on a bed of chips (6413 calories, 65 tsp fat total)

Snack: Family-sized pizza with a side of chicken wings (3372 calories, 35 tsp fat total)

Barbecue dinner: Burgers with two patties, bacon, cheese, hash brown, pickle and beetroot. Plus sausages, beers, soft drink, chips (1640 calories, 17 tsp fat total)

Hall wasn’t the only one suffering. Commando’s family ate this fried chicken and chips for breakfast! Source: Channel 10

The super fit 30-year-old shared her biggest horror stories from the week with news.com.au.

• “We didn’t drink any water, we just drank soft drink, and that for me is liquid lollies, absolute poison, I never go near it.”

• “One of my contestants will drink six litres [of soft drink] a day, which converts to 500 grams of sugar a day, and if you consider you only need a teaspoon of sugar a day to survive he was definitely overdoing it.”

• “My skin broke out, I had a rash of acne and by day two I had the worst hormonal acne, so it just shows you’re living on preservatives and chemicals and sugar and I was ravenous.”

• “Sugar is an appetite stimulant, and I knew this all academically, but to put yourself through it and to feel it physiologically ... Usually I control my appetite to eating every four hours and I’m never ravenous, but the more crap I ate the hungrier I got.”

• “It effects you psychologically, we couldn’t train that week but even if I had been allowed to and wanted to, I couldn’t. I was so bloated my stomach had expanded out like I was four months pregnant.”

Hall weighed in at 53kg before her week with the Hailwood family. Source: Channel 10

• “I couldn’t sleep, my mood was low, I was like, ‘this is a nightmare’. No wonder they don’t feel like training or being active, because with the food they eat, they can’t! It’s poison.”

• “We never used plates and we never used bowls. They had no portion control, they served all their food on shared platters, so they had no idea of the amount they were consuming.”

• “They didn’t just bake a chocolate cake in a normal tin and then serve the cake up for dessert, they baked it in a casserole dish and then they would put the dish on their lap, put a litre of ice cream on top of the chocolate cake in the dish and then just eat it out of the dish.”

• “They said ‘food has become an addiction and it’s all we have to share with each other’.”

Michelle Bridges was reduced to tears when her family served her up this 2.5kg beef burrito. Source: Supplied

Hall, who has achieved huge success with her clients by applying her martial arts philosophy of training the mind to train the body, admits she had an immense challenge on her hands this season.

The former Gladiator said the first step with the Hailwood family — consisting of three sisters Sylvia, 28, Kayla, 24, and Sam, 26, and Sam’s partner Cliff, 26 — was a complete kitchen and pantry overhaul, followed by changing their bad habits so that they would learn to stop connecting with each other over food.

“It’s a psychological issue. Some of my contestants were battling depression and troubled childhoods. One of my contestants had just lost his father, so he was grieving while he was on the show,” she said.

“They were in the wrong headspace and it is psychological, it is emotional, weight is emotional.”

Hall training the Hailwood family in the Biggest Loser gym. Source: Channel 10

Hall joins trainers Michelle Bridges, Shannan Ponton, and Steve ‘Commando’ Willis this season, and said the return to the popular ‘Families’ format will allow viewers to get behind the teams as they work towards the same goal.

“There are big bust ups, big blow ups, but at the core of this show love always wins, love and the family bond.

“To see this family come together for the first time on a shared goal and to inspire each other, make each other healthy and then to see that infiltrate into their family and their communities at home, it’s so positive and empowering and addictive.”

The 10th season of The Biggest Loser Australia starts on Sunday, September 13 at 7.30pm and will air Sunday, Monday and Tuesday nights on Ten.

Tough as nails: Tiff Hall training with Cliff in the Biggest Loser gym. Source: Channel 10

TBL team: Shannon Ponton, Michelle Bridges, host Fiona Faulkiner, Tiffiny Hall and Commando. Source: Channel 10

Watch Michael Mosley's documentary that spawned the popular 5:2 Diet.