This fact sheet estimates population sizes and describes differences between food stamp recipients and non-recipients among California adults, ages 18-64, whose household income is below 130% of the Federal Poverty Level. Using data from the 2001 California Health Interview Survey, the number of poor adults under age 65 who are potentially eligible for the Food Stamp Program is approximately four million (3,978,000). Only 12.3 percent (489,000) of these four million adults report receiving food stamps, while 87.7 percent (3.5 million) are not receiving food stamps. Many of the non-recipients (over one million) report being food-insecure, with 325,000 reporting hunger and the remaining 756,000 at risk for hunger. The Food Stamp Program is part of this country's safety net for low-income households and a defense against hunger. However, this analysis finds there are many low-income adults who may be eligible and may need food assistance but are not receiving it.