I suspect that income and education level could be relevant here as a proxy for other dietary trends. People with higher incomes tend to eat better quality food overall than poor people. People with higher education levels also tend to make different dietary choices (and are probably more likely to seek out more "natural" foods or whatever the current research is pointing toward).
You can always tell a dingbat by how much Mountain Dew they drink.
I've been telling my friends that drink it(in large quantities) that they are better off drinking coffee for their stim fix(caffeine) than that disgustingly over-sugared green goo. It's common knowledge that sugar in large quantities(and sugar is pretty much every processed food in the US) is really the reason for most First World health problems.
Sugar, in all it's forms(HFCS. et al) is the post Tobacco Tobacco...
The real question is whether the health community will be able to unseat Big Sugar from it's control over the American Diet.