Figure 2.

Comparisons of serum isoflavone concentrations and equol producer in the controls in each country. Comparison of serum isoflavone concentrations and ratios of equol producers among adults in Japan, Korea, the United States and Germany. The serum concentrations of genistein and daidzein are extremely high in Japanese and Korean subjects, who have a daily intake of soy‐derived food products, in comparison with US and German subjects. Of special mention is the ratio of equol products (the fourth column from left in the graph). Among control groups without prostate cancer, there was a marked difference in the proportion of equol producers in each country: Japan (50%), Korea (59%), USA (14%), Germany (6%).