• Tatiana Almeida de Moraes Campos, AnjosLuiz Antonio DosLADPrograma de Pós-Graduação em Ciências da Nutrição da Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil; Faculdade de Nutrição Emília de Jesus Ferreiro, Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil, Maria Thereza Baptista Wady, and Vivian Wahrlich.
• Programa de Pós-Graduação em Ciências da Nutrição da Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil. Electronic address: tamnutri@gmail.com.
• Nutrition. 2024 Nov 1; 127: 112552112552.

ObjectiveThe present study aimed to compare measured and estimated resting metabolic rate (RMR) predicted by selected equations in patients with nonactive inflammatory bowel disease (IBD) on an outpatient university clinic regimen.Research Methods & ProceduresSeventy-two adult (≥20 years) IBD patients (45 with Crohn's disease-CD) had RMR measured (mRMR) by indirect calorimetry and also estimated by predictive equations (Cunningham, Henry, Anjos et al., and Marra et al.). Body composition was assessed by DXA. Absolute Bias (estimated - mRMR) and % Bias (Bias/mRMR) were calculated. Agreement was assessed as the limit of agreement (LoA) in the Bland & Altman approach.ResultsThere was no difference in age, body composition and mRMR between individuals with CD (5414.2 ± 1023.7 kJ/day) and ulcerative colitis (5443.9 ± 1008.9 kJ/day). Among the equations, only the Anjos et al.'s population-specific equation (-52.1 [642.0] kJ/day, P = 0.493; LoA: -1311; 1206 kJ/d) accurately estimated RMR. The equations of Marra et al. produced the highest % Bias (24.1 ± 14.8%). The Bland & Altman plots showed that the range of the LoA was relatively similar for all equations. In the simple regression analysis, the model with FFM resulted in a higher coefficient of determination (R2 = 0.51 for DC 0.74 for UC) compared to the model that included BM (R2 = 0.35 for DC and 0.65 for UC).ConclusionsAmong the equations analyzed, only Anjos et al.'s accurately estimated RMR in outpatients with nonactive IBD. However, caution is advised when applying it at the individual level, due to the wide observed LoA.Copyright © 2024 Elsevier Inc. All rights reserved.

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