This study investigated how acculturation varies with demographic variables and is related to dietary habits among Korean Americans. The respondents were 162 Korea Americans aged at least 18 years old residing in the Greater New York metropolitan area. The level of acculturation was measured using a modified Suinn-Lew Asian Self-Identity Acculturation(SL-ASIA) scale. Acculturation was operationally defined to be composed of 6 factors, which are language, media use, friendship, food, pride, and ethnic self-identity. Each factor in the level of acculturation was identified by how it is related to demographics and dietary habits in the method of correlation coefficients and stepwise multiple regressions analyses. The reliability of the modified SL-ASIA scale was high as measured by Cronbach alpha of .92. The level of acculturation was related to place of birth, age, length of residence in the U.S., and education. The younger, the longer they had lived in the U.S., and the more they were educated, the more acculturated. Acculturation could be predictable for 52% of its variance with all demographic variables. Among the 6 factors in the level of acculturation, five of them, language, media use friendship, food, and ethnic self-identity were correlated with dietary habit changes after immigration and type of meals. All 6 acculturation factors could predict 21% of change in dietary habits. the information from this study can be used to describe usual describe usual dietary habits according to various aspects of acculturation to better understand the dynamics among acculturation, demographics, and dietary habits.