A United States Department of Agriculture report contends that 14.5% of U.S. households experienced some degree of insufficient "food security" in 2012. Essentially "food insecurity" is a situation in which one or more members of a household lack consistent access to the nutrition necessary for proper health and well-being.
A link to the U.S.D.A. report is below.
Department of Agriculture: Approximately 15% of U.S. Households Experienced "Food Insecurity" in 21012
"An estimated 14.5 percent of American households were food insecure at least some time during the year in 2012, meaning they lacked access to enough food for an active, healthy life for all household members."
---U.S. Department of Agriculture