I recently received an overview from the Colorado Department of Public Health. This information was distributed from Washington. While I fully believe the government does not tell us the "whole story" most of the time, in times of large public health concerns they provide a good starting point from where to get information and are more reliable than many other sources out there. The summary is likely far more detailed than most people would want to read but I decided to repost it verbatim. The general consensus is that there is no current danger to the American food supply and that agencies are aggressively monitoring the situation. Additionally there are no reports of dangerous radiation levels in the states. Taking something for radiation exposure is not needed.
While I agree that the food supply is safe, it's as good a time as any to make some changes and buying some local products. While produce season is not in fully swing locally, there is always a great supply of locally produced animal products, free of added toxins. As we move deeper into Spring and Summer, explore the wealth of farmers markets around town and search out for local produce in grocery stores. The less distance food needs to travel to your table, the less preservatives and processing it will likely have received.
Please click on the Japan tab in the health information section on the left for the full article.