They appear to be the group with USDA data to back up their claims regarding a measurable fact of material reality. If you have better data, please, do share.

This is a content free comment. Please stop sucking the oxygen out of the thread. Nutrition information specific to the US cross-tabbed by income is a pain in the ass to find, but it is out there. If you want to refute a study, you'll actually have to refute it, not simply cast aspersions on its authors.