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Factors influencing energy intake and body weight loss after gastric bypass

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Abstract

Objective: The gastric bypass-induced quantitative and qualitative modifications of energy intake (En In, kcal/day) and their impact on body weight (bw) loss were evaluated. The factors influencing energy intake and body weight loss were also investigated.

Design: Longitudinal study.

Setting: University Hospital of Geneva.

Subjects: Fifty obese women undergoing a Roux-en-Y gastric bypass.

Results: The reduction of EnIn was significantly related to bw loss expressed either in kg or as percentage correction of excess bw (P<0.01 for both), whereas the post-operative modifications of diet composition did not play a role. Age and initial bw significantly influenced bw loss (P<0.0001 and P<0.001, respectively), as shown by multiple regression analysis. Patients were divided into four sub-groups according to their age (under or over 35 y) and initial bw (under or over 120 kg). ANOVA showed that under 35-y-old subjects reduced their EnIn significantly more than their older counterparts having similar bw (P<0.02 and P<0.05); consequently, bw loss, expressed in kg, was significantly (P<0.0001 and P<0.0005) larger in younger patients. Subjects with an initial bw over 120 kg lost significantly (P<0.001 and P<0.02) more weight as compared to patients with a smaller degree of obesity (under 120 kg) and similar age.

Conclusions: Gastric bypass-induced body weight loss is mainly due to the reduction of EnIn, whereas the qualitative modifications of the diet do not play a role. Younger subjects have a greater capacity to reduce EnIn and, therefore, lose more weight. Pre-operative high degree of obesity leads to a larger weight reduction, probably because of a greater energy deficit.

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Acknowledgements

This study was partially supported by the Swiss National Funds for Scientifical Research, grant no. 32-61339.00 and by a grant from the Ernst and Lucie Schmidheiny Foundation.

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Author notes

  1. E Bobbioni-Harsch: Guarantor: E Bobbioni-Harsch.

  2. E Bobbioni-Harsch, O Huber, Ph Morel, G Chassot, T Lehmann, M Volery, E Chliamovitch, C Muggler and A Golay: Contributors: O Huber, Ph Morel, G Chassor, T Lehmann, M Volery, E Chliamovitch, C Muggler and A Golay.

Authors and Affiliations

  1. Division of Therapeutic Education for Chronic Diseases, Geneva University Hospital, Geneva, Switzerland

    E Bobbioni-Harsch, T Lehmann & A Golay

  2. Clinic of Digestive Surgery, Geneva University Hospital, Geneva Medical School, Geneva, Switzerland

    O Huber, Ph Morel, G Chassot, M Volery, E Chliamovitch & C Muggler

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  1. E Bobbioni-Harsch
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  2. O Huber
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Bobbioni-Harsch, E., Huber, O., Morel, P. et al. Factors influencing energy intake and body weight loss after gastric bypass. Eur J Clin Nutr 56, 551–556 (2002). https://doi.org/10.1038/sj.ejcn.1601357

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  • DOI: https://doi.org/10.1038/sj.ejcn.1601357

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