Now there are calls for nursery aged children to be taught healthy eating in similar clubs.
In just one week in July, almost 170 children between the ages of 11 and 15 attended classes in Wales launched by a weight loss club.
Kick boxing enthusiast Ethan, 13, joined a Slimming World class in Caerphilly county when he discovered he could not compete in the right weight category for his age at the kick-boxing world championships.
He explained that he didn’t want to be a in a weight category with boys taller and heavier than him, so he decided to lose weight.
Since joining the slimming class in April he has lost 6lbs (2.7kg).
He told the BBC how he used to snack on half a packet of biscuits with a cup of tea as a treat, but that his bad habits made him feel grumpy and sad at times. Now he eats more fat free yoghurts…Read more