Once I saw an excellent BBC documentary about the issue Ryan is talking about. They compared cheap and more expensive brands of the same kind of meal. They did lab tests with Tesco brands and others of similar quality) and compared them to the expensive ones. The cheaper the product was, the more fat, sugar, empty calories it contained. That is not true in all cases, there are always exceptions, but generally speaking, it is true.
Next time when you go shopping, just compare the ingredients in cheap and expensive sausages, for example.
Here, in Slovakia, the meat content may be between 30% and above 90%. That's a huge difference. Unfortunately, many people will only buy the cheapest ones, as most common salaries are about 500-700€ /month (minimal wage is 380€/month)with food prices comparable to the US. Ground beef is for 3,5-4€/ kg. Of course, chicken and pork are cheaper, as beef is the most expensive kind of meat (not counting freshwater fish, that is expensive too, but people only rarely buy them).
What I have noticed is that many people drink only soda. That is particularly dangerous I think. It not only contains many calories, but if you sip it throughout the day it may have a negative effect on insulin production and may lead to Diabetes in the long run. I have seen kids drink 1.5-2L bottle of soda at school. They get used to it so much they don't even think about drinking pure water any more. I often see mothers give very young children, even younger than 1 year tea with sugar. I work at the shop and once a mother asked me for a drink for her child (3 years?). I offered a mineral water, but she was totally surprised like."I was asking for a drink for my CHILD! Don't you have anything sweet?"
Anyway, back to your question. Statistically, we have a high rate of children who are overweight or obese, but I seldom see them. And I teach at school and kindergarten part time. Some kids are bigger (but they are also taller with stronger bones) but there are only a few kids I would call overweight. But PE teachers say their speed and strength deteriorate rapidly and many kids are not interested in sports, they refuse to exercise.