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Whey Protein Supplementation Enhances Body Fat and Weight Loss in Women Long After Bariatric Surgery: a Randomized Controlled Trial

Obesity Surgery volume 27, pages 424–431 (2017)Cite this article

Abstract

Background

The ideal nutritional approach for weight regain after bariatric surgery remains unclear.

Objective

The objective of this study is to assess the effect of whey protein supplementation on weight loss and body composition of women who regained weight 24 or more months after bariatric surgery.

Methods

This is a 16-week open-label, parallel-group, randomized controlled trial of women who regained at least 5 % of their lowest postoperative weight after a Roux-en-Y gastric bypass (RYGB). A total of 34 participants were treated with hypocaloric diet and randomized (1:1) to receive or not supplementation with whey protein, 0.5 g/kg of the ideal body weight. The primary outcomes were changes in body weight, fat free mass (FFM), and fat mass (FM), evaluated by tetrapolar bioelectrical impedance analysis (BIA). Secondary outcomes included resting energy expenditure, blood glucose, lipids, adiponectin, interleukin 6 (IL-6), and cholecystokinin levels. Statistical analyses included generalized estimating equations adjusted for age and physical activity.

Results

Fifteen patients in each group were evaluated: mean age was 45 ± 11 years, body mass index (BMI) was 35.7 ± 5.2 kg/m2, and time since surgery was 69 ± 23 months. Protein intake during follow-up increased by approximately 75 % in the intervention group (p = 0.01). The intervention group presented more body weight loss (1.86 kg, p = 0.017), accounted for FM loss (2.78, p = 0.021) and no change in FFM, as compared to controls (gain of 0.42 kg of body weight and 0.6 kg of FM). No differences in secondary outcomes were observed between groups.

Conclusions

Whey protein supplementation promoted body weight and FM loss in women with long-term weight regain following RYGB.

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Acknowledgments

This study was sponsored by CNPQ under process number 476459/2011-7; notice/universal call 14/2011 and by Fundo de Incentivo à Pesquisa e Eventos (FIPE) of the Hospital de Clínicas de Porto Alegre (HCPA).

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Authors and Affiliations

  1. Department of Nutrition, University of Brasilia, Brasilia, Brazil

    Daniela Lopes Gomes, Fernanda Bassan Lopes da Silva, Eliane Said Dutra & Kenia Mara Baiocchi de Carvalho

  2. Endocrine Division, Porto Alegre Clinical Hospital, University of Rio Grande do Sul, Porto Alegre, RS, Brazil

    Milene Moehlecke & Beatriz D’Agord Schaan

Authors
  1. Daniela Lopes Gomes
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  2. Milene Moehlecke
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  3. Fernanda Bassan Lopes da Silva
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  4. Eliane Said Dutra
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  5. Beatriz D’Agord Schaan
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  6. Kenia Mara Baiocchi de Carvalho
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Corresponding author

Correspondence to Daniela Lopes Gomes.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Conflict of Interest Disclosure Statement

The authors have no commercial associations that might be a conflict of interest in relation to this article.

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Lopes Gomes, D., Moehlecke, M., Lopes da Silva, F.B. et al. Whey Protein Supplementation Enhances Body Fat and Weight Loss in Women Long After Bariatric Surgery: a Randomized Controlled Trial. OBES SURG 27, 424–431 (2017). https://doi.org/10.1007/s11695-016-2308-8

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  • DOI: https://doi.org/10.1007/s11695-016-2308-8

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