e13694 Background: Cachexia, a complicated metabolic syndrome often related to cancer, is associated with anorexia, decreased quality of life, and increased mortality in advanced disease. The overall prevalence of cachexia ranges from 40% at cancer diagnosis to 70% in advanced disease. Our team aimed to determine whether racial and socioeconomic factors are associated with incidence of cachexia or being underweight at diagnosis (UAD) in patients with gastrointestinal (GI) tract cancer in a diverse, multiethnic urban medical center with high Asian-American representation. Methods: Using ICD-10 codes, adult (age ≥18) patients with diagnosis of primary GI carcinoma between 1/1/2013 to 12/31/2022 were identified. Those with secondary GI involvement from non-GI malignancies were excluded. Patient height, weight at time of diagnosis (weight measured within 4-week window from pathologic diagnosis date), and highest weight within 6 months preceding diagnosis date were recorded. Demographic data included: race, primary language, tumor origin, cancer stage and social deprivation index (SDI). Cachexia was defined as weight loss within a 6-month period of >5% of initial body weight, or weight loss >2% if body mass index (BMI) was <20kg/m2. UAD was defined as BMI <18.5kg/m2 at the time of diagnosis. Results: Of 718 patients with newly diagnosed GI cancer, 366 were analyzable for weight change. 61.2% were male. Race distributions were: 62.0% White, 23.8% Asian, 11.5% Black, and 2.7% Other. The primary languages spoken were: 76.5% English, 19.4% Asian-language, and 4.1% Other. The tumor originated from the following areas: 63.7% lower GI tract, 27.0% upper GI tract, and 8.5% hepato-pancreaticobiliary. 8.5% were UAD and 26.4% met criteria for cachexia at the time of diagnosis. Race and UAD had a significant association; Asians (p=.002) and those speaking Asian languages (p<.001) were more likely to present UAD. However, no significant relationship existed between race (p=.780) or language group (p=.656) on cachexia incidence. Tumor origin groups trended towards differences in cachexia incidence (p=.061). Mean SDI was significantly higher in those who were UAD (p=.026). The SDI was slightly higher among those who had cachexia, but this was not statistically significant (p=.244). Conclusions: GI cancer patients of Asian race, who primarily speak an Asian language, and those with higher SDI are more likely to present UAD, but these same factors are not associated with incidence of cachexia at diagnosis. Additional research is needed to determine if being UAD is associated with development of cachexia later in the illness trajectory or affects clinical outcomes for patient with GI cancer.