1. Objectives: This investigation compares the eating behaviors across normal-weight male groups of different Sasang constitutional types. 2. Methods: We recruited 31 male participants aged 20-35 with BMI 18.5-23. The eating behavior was assessed using Gastrointestinal Symptom Rating Scale (GSRS), Bulimia Test Revised (BULIT-R), Korean Version of Eating Attitude Test-26 (KEAT-26), and Dutch Eating Behavior Questionnaire (DEBQ). 3. Results: 1) Assessments made by GSRS, KEAT-26, and BULIT-R were not significantly different across different Sasang constitutional types. (p<0.05) 2) The Soeum group showed significantly lower BMI and body weight compared to the Soyang and Taeeum groups. 3) The Emotional eating subscale of DEBQ differed significantly across different Sasang constitutional types. (p<0.05) 4) The Soeum group showed a significantly lower Emotional eating subscale score of DEBQ compared to the Soyang and Taeeum groups. 4. Conclusions: The results of this study suggest that emotional factors could influence eating behaviors differently across different Sasang constitutional types, in which the Soeum type is less affected than the Soyang type by emotional states.