If you are like me and are concerned about the radiation in food then you should look at this site. It is the Ministry of Health, Labour and Welfare's site and you can stay up to date on every food item that is being tested and all of the current food restrictions. Scroll down the bottom under "Reported on:", it shows all of the different foods that are being tested each day and the radiation levels. This site made me far more comfortable with purchasing local foods from Japanese supermarkets. Items that are measuring some radiation like blueberries I have decided to avoid locally grown and other items like eggs and milk which are measuring none or almost no radiation I am happy to purchase from anywhere.
Website: Ministry of Health, Labour and Welfare