Nutritional Status and Body Composition of Adult Patients With Crohn's Disease

Inclusion Criteria: * Age ≥ 18 years old; * diagnosis of CD; * Admission time \<48 hours; * Subject has voluntarily signed and dated an informed consent form. Exclusion Criteria: * Emergency surgery for intestinal fistula or abdominal abscess; * Unstable vital signs or unstable hemodynamics; * Pregnant or lactating women; * Admission to hospital due to other critical illnesses (such as tumor, HIV, severe infections requiring ventilator or CRRT treatment); * Dying patients whose life expectancy does not exceed 24 hours; * Severe liver insufficiency (liver function score 11-15 or total bilirubin\> 3mg/dL or tissue biopsy diagnosed as liver cirrhosis, hepatic encephalopathy, portal hypertension with history of gastrointestinal hemorrhage, etc.); * Severe renal insufficiency (creatinine value is 2 times higher than the upper limit of normal); * Severe metabolic diseases (such as metabolic syndrome, hyperthyroidism, etc.); * Patients whose burn area exceeds 20% of the body surface area; * Immunodeficiency, autoimmune disease, or receiving immunosuppressive treatment for diseases other than CD (such as organ transplantation, etc.); * Those who are not suitable for body composition analysis * Patients who have been selected for other clinical studies or have been selected for this study; * Subjects are unwilling to participate in this study or refuse to sign informed consent.