The Biggest Loser ran for 18 seasons before ending in 2016, and it's now the subject of a major docu-series showing the behind the scenes moments from the show.
A study following 14 contestants after their time on the show found all but one had regained the weight they had lost, and most surpassed the weight they were at the start of the show.
LISTEN ABOVE

Alex Flint: Training for your body type
40:36

David Letele: Why are we always getting in our own way when we're getting healthy?
40:44

Matt Doocey: We've come a long way with mental health
40:58