In order to investigate the changes in diet of the Japanese accompanying sudden changes in the dietary environment ocassioned by a move to a foreign country, a questionnaire survey was conducted between January and March, 1980 on 32 Japanese households having stayed in New York City or its vicinity for more than three months but less than three years. Consumption of the following foods increased in US: beef, dairy products, fruits such as oranges and melons, fruit juice and staples such as bread and pasta. These foods are obtainable more easily and at lower prices in US than in Japan, and the respondents had tasted them even while living in Japan. Foods such as lamb, turkey and duck which they had not consumed in Japan did not increase in consumption in US, even though they were more readily available. The respondents consumed less pork, processed soybean foods such as bean curd, fish paste products, sea food and steamed rice; these foods are not as readily available in US as in Japan. Although their consumption of steamed rice, noodles and processed soybean foods decreased while in US, the respondents ate these foods 9, 2.5 and 3.2 times per week respectively. Radical changes in the dietary environment caused by the move affected the kinds of food and frequency of their intake because of the ready availability and individual dietary experiences. However, they retained some of uniquely Japanese dietary habits such as eating steamed rice as staples.