Are Healthy Foods Really More Expensive? It Depends on How You Measure the Price
http://www.ers.usda.gov/Publications/EIB96/EIB96.pdf
Compares prices of healthy and less healthy foods using three different price metrics and finds, for all metrics except the price of food energy, that healthy foods cost less than less healthy foods (defined as foods high in added sugar, saturated fats and/or sodium and that contribute little to meeting daily dietary requirements). From the Economic Research Service of the U.S. Department of Agriculture