2.1. Data

This study used two forms of national statistical data in Japan. The first was the National Crop Survey (NCS). The NCS clarified the actual conditions of crop production and shipment and prepared materials to formulate production targets and promote various measures in the food, agriculture, and rural basic plans [25]. The NCS surveyed the crop acreage, yield, and shipment amount of all agricultural product shipping organizations in the target prefectures [25]. The second was the National Health and Nutrition Survey (NHNS). The NHNS investigated Japanese citizens’ physical condition, nutrient intake, and lifestyle. In addition, it obtained basic data to comprehensively promote people’s health, based on the Health Promotion Law [26,27]. The details of both of surveys are as described in the previous study [24].