BACKGROUND: The present study aimed to investigate the influence of food intake on body weight loss (WL) and the association of gene polymorphisms, 1 year after Roux-en-Y gastric bypass (RYGB) surgery. METHODS: In total, 95 obese women (age ranged 20-50 years) in a Brazilian cohort underwent RYGB surgery and completed the study. Anthropometric measurements and food intake were assessed before and 1 year after surgery. Twelve gene polymorphisms (GHRL rs26802; GHSR rs572169; LEP rs7799039; LEPR rs1137101; 5-HT2C rs3813929; UCP2 rs659366; UCP2 rs660339; UCP3 rs1800849; SH2B1 rs7498665; TAS1R2 rs35874116; TAS1R2 rs9701796; and FTO rs9939609) were determined using a real-time polymerase chain reaction and a TaqMan assay. The subjects were divided into quartiles regarding percentage of excess weight loss (%EWL). The effect of genetic variants on energy and macronutrient intake was evaluated by simple logistic regression, followed by multiple logistic regression. RESULTS: Subjects in the first and second quartiles showed a higher initial body mass index. Energy and macronutrient intake before and 1 year after RYGB surgery did not differ between the %EWL quartiles. None of gene polymorphisms investigated showed an association with the estimated energy intake 1 year after surgery. CONCLUSIONS: In conclusion, the estimate energy and food intake did not predict a greater body WL 1 year after RYGB surgery. In addition, the 12 gene polymorphism investigated did not affect the energy intake among female patients.
BACKGROUND: The present study aimed to investigate the influence of food intake on body weight loss (WL) and the association of gene polymorphisms, 1 year after Roux-en-Y gastric bypass (RYGB) surgery. METHODS: In total, 95 obese women (age ranged 20-50 years) in a Brazilian cohort underwent RYGB surgery and completed the study. Anthropometric measurements and food intake were assessed before and 1 year after surgery. Twelve gene polymorphisms (GHRL rs26802; GHSR rs572169; LEP rs7799039; LEPR rs1137101; 5-HT2C rs3813929; UCP2 rs659366; UCP2 rs660339; UCP3 rs1800849; SH2B1 rs7498665; TAS1R2 rs35874116; TAS1R2 rs9701796; and FTO rs9939609) were determined using a real-time polymerase chain reaction and a TaqMan assay. The subjects were divided into quartiles regarding percentage of excess weight loss (%EWL). The effect of genetic variants on energy and macronutrient intake was evaluated by simple logistic regression, followed by multiple logistic regression. RESULTS: Subjects in the first and second quartiles showed a higher initial body mass index. Energy and macronutrient intake before and 1 year after RYGB surgery did not differ between the %EWL quartiles. None of gene polymorphisms investigated showed an association with the estimated energy intake 1 year after surgery. CONCLUSIONS: In conclusion, the estimate energy and food intake did not predict a greater body WL 1 year after RYGB surgery. In addition, the 12 gene polymorphism investigated did not affect the energy intake among female patients.