How can we combat the rising child obesity rates?

The UK government is already displaying a "traffic light" system on ready meals which shows whether they have large, medium or low amounts of sugar and fats in them. They are making it easier for people to make healthier choices, on behalf of themselves and their children. Cookery classes are also held in schools to teach children to cook from scratch. I don't know if these also include lessons on how to make healthier choices but if not, these could be added. It is understandable if working parents are exhausted on weekdays but perhaps they could consider cooking with the kids at weekends, to learn about and explore food together and find how fun cooking and eating healthy food can be.