Eighty-nine percent of U.S. households were food secure throughout the entire year 2003 (fig. 1). "Food secure" means that all household members had access at all times to enough food for an active, healthy life. The remaining 12.6 million U.S. households (11.2 percent of all households) were food insecure at some time during the year. That is, they were, at times, uncertain of having, or unable to acquire, enough food for all household members because they had insufficient money and other resources for food. About two-thirds of food-insecure households avoided hunger, in many cases by relying on a few basic foods and reducing variety in their diets. But 3.9 million households (3.5 percent of all U.S. households) were food insecure to the extent that one or more household members were hungry, at least some time during the year, because they couldn't afford enough food.
AHHHHHHH it says right there on the USDA website that 3.5 % of households hand one or more members hungry at least some time.
1 in 5 is 20 % so where did your number come from Bobert?