Hazardous materials released by our industrial activities have been globally dispersed in the environment and finally taken up by humans through various pathways. In particular, the ingestion pathways are very important for evaluating the human health risks caused by the global low-level chronic contamination. In many cases, health risks caused by ingestion are evaluated for the average group with the average dietary habit, however, the dietary habit has variation with the living region and the job. Therefore, the health risks include some variation associated with this variation. In this study, Japanese dietary habit was statistically analyzed by using the annual report of the daily intake of food in many regions in Japan and the variation of the health risks by Japanese dietary habit was quantitatively analyzed using the mathematical model for the evaluation of the risk to the Japanese health caused by chronic global radioactive ¹³⁷Cs food contamination.