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. Unlike the American version, weight loss is measured in tenths of kilograms instead of pounds. Personal trainers Michelle Bridges, Shannan Ponton, Steve Willis and Tiffiny Hall are responsible for training the contestants and helping them to lose weight.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | April 2011 | 1 | |
| Season 1 | February 2006 | April 2006 | 53 |
| Season 2 | February 2007 | April 2007 | 68 |
| Season 3 | February 2008 | May 2008 | 74 |
| Season 4 | February 2009 | April 2009 | 75 |
| Season 5 | January 2010 | April 2010 | 67 |
| Season 6 | January 2011 | May 2011 | 53 |
| Season 7 | January 2012 | May 2012 | 72 |
| Season 8 | March 2013 | May 2013 | 34 |
| Season 9 | January 2014 | April 2014 | 33 |
| Season 10 | September 2015 | December 2015 | 39 |
| Season 11 | March 2017 | May 2017 | 28 |
| Unassigned Episodes | 0 |
| Season | From | To | Episodes |
|---|---|---|---|
| Unassigned Episodes | 597 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 597 |
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