Sustainability encompasses many meanings, the least of which is the ability for something to be maintained for future generation use. One important aspect of sustainability is food security, which is defined by the United Nations as the availability and access to sufficient, safe, nutritious food to maintain a healthy and active life. The USDA has compiled data over the years reporting 12.7 percent (15.8 million) of U.S. households to be food insecure at some time during 2015. This includes households which are uncertain of having, or unable to acquire, at some time during the year, enough food to meet the needs of all their members due to insufficient money or other resources for food. From 2013 to 2015, the U.S. national average of food insecurity came in just below 14 percent.