United States Department of Agriculture http://www.usda.gov/oce/foodwaste/sources.htm rate of 40 percent over 30% of food waste occurs after we purchase it between 30-40% USDA estimates 30 and 40 percent United States Department of Agriculture 40% of food is thrown away every year United States Department of Agriculture http://www.usda.gov/oce/foodwaste/sources.htm https://www.usda.gov/oce/foodwaste/sources.htm over 30% of food waste occurs after we purchase it 30% to 40% United States Department of Agriculture over 30% of food waste occurs after we purchase it 30 and 40 percent https://www.usda.gov/oce/foodwaste/sources.htm