Source: Alisha Coleman-Jensen, Matthew Rabbitt, Christian Gregory, and Anita Singh, United States Department of Agriculture, Economic Research Service, Economic Research Report No. ERR-194, September 2015
From the abstract:
An estimated 14.0 percent of American households were food insecure at least some time during the year in 2014, meaning they lacked access to enough food for an active, healthy life for all household members. The change from 14.3 percent in 2013 was not statistically significant.The prevalence of very low food security was unchanged at 5.6 percent.
Statistical Supplement to Household Food Security in the United States in 2014