Well I've got the solution:
Tell the public the truth about what causes child obesity, i.e. eating salty food, and the truth about how to reduce obesity, i.e. avoid salt and salty food.
Stop claiming that exercise reduces or prevents obesity. - It doesn't.
Make it clear that dieting and calorie reduction do NOT reduce obesity.
Ban food manufacturers from producing breakfast cereals high in added salt.
Here is the truth about child obesity: Children and Obesity
See also Sodium in foods
Read my Mensa article on Obesity and the Salt Connection