At just seven years old Dzhambulat Khatokhov ('Jambik' for short) is four foot three inches tall and weighs 16 stone - as much as a baby elephant. He dwarfs his older brother who is twice his age and less than half his weight. Nobody knows why Jambik is so big, or what this means for his long-term health. But Dr Campbell - one of the world's leading experts on obesity - is determined to find out.
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