The Japanese foreign ministry guaranteed the safety of its food products in an email this week, saying less than .7 percent of food produced in Japan was found to have an excess level of radionuclides. Concerns over radiation in Japan stem from the 2011 Fukushima nuclear disaster. Japan adheres to radiation norms contained in UN's Codex Alimentarius, which it calls the strictest in the world.

Only 5.4 percent of seafood caught off the coast of Fukushima this year was found to be above radiation limits, compared to 53 percent in 2011. The Japanese guarantee of food safety is the result of tests on 412,959 food items between April 1, 2012 and August 31, 2013, 2,888 of which tested above acceptable limits.