On 16 May it was revealed that the 2009 season of the Biggest Loser was the last to feature host Ajay Rochester.Biggest Loser Season 5 was the second series to feature couples.
A fifth season, which aired on 31 January 2010, featuring former Olympic swimmer Hayley Lewis as the new host, and in 2011 the show introduced the new trainer Tiffiny Hall.
In its eleventh season, the show introduced new trainer Libby Babet.
This is an Australian version of the program first aired at 7.00pm each weeknight on Network Ten from 13 February, to the final episode on 27 April 2006 where the first Australia's Biggest Loser was awarded A$200,000.
The program, directed by Ian Stevenson, featured the same personal trainers as the US version, Bob Harper and Jillian Michaels with Australian host Ajay Rochester.
The show will not return in 2018 due to low ratings.
The series involves contestants who are overweight to varying degrees participating in a contest to lose the most percentage of weight, with teams and contestants voting out each other.
On 24 June 2008, it was announced on the official website that there would be a fourth season of the show, The Biggest Loser Australia: Couples.
After complaints from neighbours "The Biggest Loser" was kicked out of the house known as the White House in Duffy's Forest, near Mona Vale.
The Walk was filmed at Bobbin Head in Ku-ring-gai Chase National Park, Turramurra, New South Wales.
Season 4 began filming at Fitzroy Island in Far North Queensland, before moving to North Head, Sydney.
Since 2015, the show has been hosted by former contestant Fiona Falkiner, It was formerly hosted by Ajay Rochester from 2006–2009 & former Olympian Hayley Lewis from 2010–2014.