Cleo is 16 and weighs in at just over 23 stone thanks to a diet of freezer food and fizzy drinks, but she and her family change their lifestyles to try to halt their weight gain.

Latvian-born Kaspars, 18, weighs in at just over 17 stone, and tries to reduce his intake of fast food and takeaways with the help of a specially tailored diet.

Dominique, a 17-year-old teenager who weights just over 18 stone, embarks on six weeks of dieting and exercising in an attempt to shed the pounds.