Poster Topical Area: Obesity

Location: Hall D

Poster Board Number: 714

P23-087 - Basal energy expenditure, body composition and weight regain after late postoperative bariatric surgery

Sunday, Jun 10
8:00 AM – 6:00 PM


To analyze basal energy expenditure (BEE) andbody compositionof patientswith and without weight regain in the late postoperative (PO) of bariatric surgery.


An observational, analytical, cross-sectional study, where adult individuals of both sexes, from 18 to 60 years old were included, who underwent bariatric surgery 2 to 7 years ago (late PO period), by Roux en-Y gastric bypass (RYGB). The percentage
of excess weight loss (%EWL) was calculated.Weight gain of more than 10% of the lowest weight obtained in the PO periodwas used to define weight regain and its prevalence was investigated.BEE was measured by indirect calorimetry (InvoiceVmax29 Encore system) after 8 hours of fasting for 30 minutes. Body composition was assessed by dual energy X-ray absorptiometry (Lunnar, DPX-IQ). Comparison between groups was performed using the independent sample T-test or Mann-Whitney, as appropriate.The data were analyzed by the software SPSS 24.0. The study was approved by the Research Ethics Committee.


Were evaluated22 volunteers (38.4±6.4 years old, 86.4% female) with a body mass index (BMI) of 29.9±4.5kg/m2 and 3.9±1.4 years of PO. The mean %EWL was 73.2% and 54.5% of the patients had weight regain in the late POperiod. The group with weight regain(n=12; 83.3% female) presented PO time of 4.7±1.2 years, BMI of 31.8±4.8kg/m2, percentage body fat (%BF) of 45.8±6.8%, fat mass (FM) of 39,6±11,1kg, fat free mass (FFM) of 46.0±8.7kg and BEE of 1539.7±148.3kcal. The group withoutweight regain(n=10; 90% female) presented PO time of 3.0±1.2 years, BMI of 27.6±3.0kg/m2, %BF of 41.3±5.6%, FM of 31,5±8,2kg, FFM of 43.8±6.5kg and BEE of 1406.0±119.0kcal. By comparison, the group with weight regainhad higher BMI (p=0.03), BEE (p=0.03) andPO time (p=0.007).The other assessed parameters did not present significant differences.


Bariatric surgery by the RYGB method was effective for the loss of excess weight, even with the weight regainof the sample. These results suggest that the postoperative time, the current BMI, and BEE may influence the weight regainof the patients in the late postoperative period of bariatric surgery.

Funding Source: CNPQ

CoAuthors: Nathalia Pizato – University of Brasilia; Gabriela Pedroso – Universtity of Brasilia; Wilson Campos Filho – Unieuro; Fernando Lamarca – University of Brasilia; Ricardo Lima – University of Brasilia; Kenia Carvalho – University of Brasilia; Eliane Dutra – University of Brasilia

Isabela Rios

University of Brasilia
Valparaiso de Goiás, Goias, Brazil