My daughter is in 3rd grade (in Greece) and she is the only kid in her class getting packaged food everyday with her without any money in her pocket. All the other kids have money, which use regularly to buy potato chips, beverages, sweets, etc from the school's shop.
Also, from what I hear from other parents, other kids regularly eat out, with the Greek souvlaki being the main food they get (which comes with fried potatos and pita), burgers and pizza.
Parents don't want to face their kids when the kids whine all the time, and in order to shut them up, they buy whatever the kids want.
The above, coupled with lack of physical activity due to various reasons, creates the obesity epidemic for kids, at least in my country.