One in six Americans food insecure in 2013
From Table 1A, Households and individuals by food security status of household, 1998-2013: 15.8% of individuals are considered food insecure (49,078,000 people] in 2013.
100/15.8 = 6.33. One in 6.33 Americans are food insecure.
United States Department of Agriculture Economic Research Service (USDA ERS), Alisha Coleman-Jensen, Christian Gregory, and Anita Singh, “Household Food Insecurity in the United States in 2013,” ERR-173, (September 2014), 6, accessed October 1, 2014, http://www.ers.usda.gov/media/1565415/err173.pdf.