['Refractory celiac disease type II (RCDII) and EATL (Enteropathy Associated T-cell Lymphoma) are (pre)malignant complications of celiac disease (CD). Data on malnutrition and intestinal absorption is lacking in these patients. Therefore, the aim of the study is to comprehensively assess nutritional status and intestinal absorption capacity of patients with RCDII and EATL, compared with data of newly diagnosed CD patients.', 'Observational study in tertiary care setting in RCDII (n\xa0=\xa024, 63.8\xa0±\xa08.2\xa0y), EATL (n\xa0=\xa025, 62.3\xa0±\xa05.7\xa0y) and CD patients (n\xa0=\xa043, 45.6\xa0±\xa014.8\xa0y). At diagnosis, anthropometry (BMI, unintentional weight loss, fat-free mass index (FFMI), handgrip strength (HGS), nutritional intake, fecal losses and Resting Energy Expenditure (REE)) were assessed.', 'Low BMI (<18.5) was more often observed in RCDII patients than in CD or EATL patients (in 33%, 12% and 12%, respectively, p\xa0=\xa00.029). EATL patients more frequently had unintentional weight loss (>10%) than CD or RCDII patients (in 58%, 19% and 39% of patients, respectively; p\xa0=\xa00.005/0.082). Energy malabsorption (<85%) was detected in 44% and 33% of RCDII and EATL patients, vs 21.6% in CD (NS). Fecal energy losses were higher in RCDII than in CD patients (589\xa0±\xa0451 vs 277\xa0±\xa0137\xa0kcal/d, p\xa0=\xa00.017). REE was underestimated by predicted-REE with>10% in 60% of RCDII, 89% of EATL, and 38% of CD patients (p\xa0=\xa00.006). Low FFMI and HGS were detected in one third and two thirds of all patients, respectively.'] Do refractory celiac disease and EATL patients show severe malnutrition and malabsorption at diagnosis?