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Background. Results on body composition in Crohn’s disease (CD) and ulcerative colitis (UC) have been heterogeneous and are lacking from Asia. Present study assessed body composition in CD/UC and correlated it with disease severity/duration. Methods. Patients of CD/UC following between Dec 2014 and Dec 2015 who consented for bioimpedance analysis for body fat measurement were included. Lean mass and fat-free mass index (FFMI) were calculated with standard formulae. Visceral fat area (VFA), subcutaneous fat area (SCA), and visceral to subcutaneous fat ratio (VF/SC) were evaluated in CD patients on abdominal CT. Results. Lean mass in CD (n=44, mean age: 41.2±15.8 years, 73% males) was significantly lower than UC (n=53, mean age: 33.2±11.2 years, 68% males; 44.2±7.8 versus 48.3±8.4 Kg, p=0.01). In both UC/CD, disease severity was associated with nonsignificant decline in BMI (UC: 22.1±4.9 versus 20.2±3.2 versus 19.9±3.2 kg/m2, p=0.23; CD: 22.1±4.2 versus 19.9±2.3 versus 19.7±4.2 kg/m2, p=0.18) and fat mass (UC: 10.9±8.9 versus 8.1±5.9 versus 5.7±3.6 kg, p=0.14; CD: 11.2±7 versus 7.9±4.4 versus 7.2±5.9 kg, p=0.16), and disease duration was associated with significant decline in FFMI (p<0.05). In CD, disease severity was associated with nonsignificant decline in SCA and increase in VF/SC. Conclusions. CD patients have lower lean mass than UC. Body fat decreases with increasing disease severity and fat-free mass decreases with increasing disease duration in both UC/CD.