personality tests, such as the Minnesota Multiphasic Personality Inventory (MMPI), might be more sensitive to reflectsubclinical personality and be more state-dependent in an individual’s lifetime, so they are good scales to predict thepsychological distress regarding certain states. The aim of this study was to identify the specific pattern between body mass index(BMI) and psychological distress using the objective personality test. We investigated BMI and the Korean Military MultiphasicPersonality Inventory (MPI). A retrospective cross-sectional study was conducted with 19-yr-old examinees who were admittedto the Military Manpower Administration in Korea from February 2007 to January 2010. Of 1,088,107 examinees, we enrolled771,408 subjects who were psychologically apparent healthy possible-military-service groups. Afterwards, we reviewed andanalyzed directly measured BMI and MPI results. In terms of the validity scales, the faking-good subscale showed an invertedU-shaped association, and faking-bad and infrequency subscales showed a U-shaped association with BMI groups. In terms ofthe neurosis scales, all clinical subscales (anxiety, depression, somatization, and personality disorder) also showed a U-shapedassociation with BMI groups. For the psychopath scales, the schizophrenia subscale showed a U-shaped association, and theparanoia subscale showed a near-positive correlation with BMI. In conclusion, a specific U-shaped pattern was observed betweenBMI and the MPI in 19-yr-old men in Korea. Underweight and obesity are related to psychological distress, so supportive adviceand education are needed to them.