London-based seven-year-old Libby is a notoriously fussy eater: she won't eat anything but calorie-laden carbs and constantly battles with her single working mum over the issue of food. Seven-year-old Lucas scavenges food from his extended family, who all live on the same street in Bradford, and Kelsie, who's also seven, comes from a family of big girls. The youngest child in the series is six-year-old Bethany, whose mum believes that healthy eating in schools has gone too far.