The Biggest Loser followed people as they tried to lose weight, but where is each season's winner now - and what have they said about their weight loss journey since? NBC debuted the controversial reality series in 2004, which followed a group of people deemed overweight who would compete in a 30-week competition. The goal was to lose as many pounds as possible to be crowned "the biggest loser." The Biggest Loser became a cultural phenomenon and ran for 18 seasons.