It may have been our fear of fallout from the impending nuclear holocaust or from nuclear power plant meltdowns that first attracted Westerners to miso. During the 60's, students of macrobiotics and Zen began hearing about Dr. Shinichiro Akizuki, director of Saint Francis Hospital in Nagasaki during the second World War. Although Akizuki spent years treating atomic bomb victims just a few miles from ground zero, neither he nor his staff suffered from the usual effects of radiation. Akizuki hypothesized that he and his associates were protected from the deadly radiation because they drank miso soup every day.
In 1972, Akizuki's theory was confirmed when researchers discovered that miso contains dipilocolonic acid, an alkaloid that chelates heavy metals, such as radioactive strontium, and discharges them from the body. However, the most convincing evidence demonstrating the protection miso offers to those exposed to radiation was published in Japan in 1989. Professor Akihiro Ito, at Hiroshima University's Atomic Radioactivity Medical Lab, read reports of European countries importing truckloads of miso from Japan after the accident at the Chernobyl nuclear power plant. Ito reasoned that if people were protected from radiation by miso, then rats that were fed miso and radiated should develop less cancer than radiated rats that were not fed miso. Professor Ito was not surprised to find that the liver cancer rate for rats that were not fed miso was 100 to 200 percent higher than that of rats that were fed miso. Ito also reported that rats that were fed miso had much less inflammation of organs caused by radioactivity.