Georgia Davis from Aberdare, South Wales, was the most obese girl ever treated at the Wellspring Academy.
And now, the 15-year-old has miraculously lost six stones in just ten weeks in the academy.
"I haven't felt this happy in a long time. I knew I had to make a change because doctors told me I was dying. My mum is ill and I need to be fit enough to look after her," British tabloid The Sun quoted Georgia as speaking from the camp in North Carolina's Blue Ridge Mountains.
She added: "This environment is very different to the one I left behind in the UK and it has inspired me to begin the transformation. I'm determined to leave here looking and feeling like a different person."
Georgia's weight skyrocketed after she developed a food addiction, which she blamed on her dad's death when she was five.
The girl, with size 38 and having Type 2 diabetes, was even banned from her school canteen for over-eating.
However, the NHS ruled the teen was too young for gastric band surgery, slimming pills or gym membership, thus leaving no hope for mum Lesley, 53.
And that's when a nurse recommended Wellspring- a health and fitness camp for the world's most obese kids-to which Georgia enrolled after being spurred on by friends and family, and with funding from well-wishers
She lost an impressive 19 pounds (almost one and a half stone) in her first week at the college.
In just one month on her new healthy eating and exercise regime, she was told her life-threatening Type 2 diabetes has disappeared.
Georgia said: "Thanks to my new diet and exercise routine I no longer have to take drugs for my diabetes or do glucose testing. Doctors have told me this should continue as long as I stick to the programme."
Today, Georgia has shrunk from a size 38 to 32.