Education outcomes, not debt fueled enrollments:

http://www.brookings.edu/research/reports/2013/06/13-facts-h... (in particular check the graducation rates based on income quartile).

Access to health care:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1483879/

Food is a harder thing to pin down. There is no doubt that americans of most any income level have access to sufficient calories, but trying to purchase healthy fresh fruits and vegetables takes up a significant portion of my monthly income (family of 5, a long distance from the bottom income levels), but I could buy huge quantities of bread and rice for much less :-)