She transformed herself from an obese 261lbs to a svelte 132lbs, taking home a 0,000 prize on Tuesday night's live show.
Dr Kevin Hall, who tested the competitors over six years, says losing the weight changed their metabolisms and hormones making it hard to stay slim Big hero: Sean Algier (left, before Biggest Loser, right afterwards) also did well.
Hall six years later were accurate.'Unfortunately, many contestants are unable to find or afford adequate ongoing support with exercise doctors, psychologists, sleep specialists, and trainers, he said, 'and that’s something we all need to work hard to change.' Hormones: Arrows point to leptin receptors in cells.
It was known that metabolisms slow with exercise, but Dr Hall's discovery that it could last for years is brand new And Sean Algaier, who started Biggest Loser at 444 pounds and dropped to 289 pounds, now weighs more than he did before, with a weight of 450 pounds and a metabolism that burns 458 fewer calories than it should.
The problem, The New York Times reported, is that the human body appears to have an 'ideal weight' - one it is easy to maintain - and will fight to restore that weight, even when efforts are being made to burn it off.
"I am excited to be in El Paso and I am ready to assist you and your family!
Big winner: Danny Cahill (pictured left, before his 2009 appearance on The Biggest Loser, and right, after) lost 239lbs in 13 weeks on the show - but like 13 of the 14 contestants tested by scientists, he put weight back on Bulk up: Cahill (pictured in 2014) packed 104lbs back on.
For anyone who has battled with their weight, and tried every fad diet going, watching The Biggest Loser has been a beacon of light on what can be possible.
Earlier this week, New York opera singer Olivia Ward was crowned The Biggest Loser of Season 11, having dropped a whopping 129lbs.
Robertson is an orthopaedic trained hand surgeon from New Orleans, Louisiana.
She specializes in the treatment of carpal tunnel and cubital tunnel syndrome, nerve and tendon disease from injury or repetitive use, as well as arthritis and fracture care.