[WATCH]: Britiain's Fattest Teenager Loses 24 Stone

When Gemma Howes weighed in at a staggering 39 and a half stone, she was Britain's fattest ever teenager. Her health was in such jeopardy that the doctor told her she would be dead before her 21st birthday if she didn't lose any weight. So Gemma decided she needed to take drastic action and underwent a gastric bypass operation. It was a risky operation - and because of her massive bulk, it meant she could have died on the operating table. But she had no choice - and has now managed to lose a staggering 24 stone - the biggest weight loss for a teenager ever in Britain. Now Gemma is expecting her first

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