Comparison of Energy and Food Intake Between Gastric Bypass and Sleeve Gastrectomy: a Meta-analysis and Systematic Review
Obesity is a developed nutritional problem, and today, surgery is one of the approaches to cure it. A good understanding of the variations in food intake will be beneficial for sustaining long-term weight loss post-surgery and for improving nutrition care strategies. The purpose of this review was the comparison of the impact of two methods of gastric bypass (GBP) and sleeve gastrectomy (SG) on dietary intake. Databases of PubMed, Embase, Scopus, Google Scholar, and Web of science were used for the literature search up to June 2018. We concluded the studies that measured mean daily energy intake and the percent of macronutrients from total calorie intake of before and after GBP and SG. A total of 18 studies were finally included in the meta-analysis for the effect of bariatric surgery on food intake. Bariatric surgery significantly decreased energy intake by 1050.04 kcal/day (p < 0.001) compared with the baseline values of energy intake. The pooled effect of bariatric surgery on protein intake was 0.82 g/day (p = 0.004) compared with the baseline values. The pooled analysis found no significant impact of bariatric surgery on carbohydrate intake (WMD = 0.56 g/day; p = 0.40) compared with the baseline values. The pooled estimate of effect for bariatric surgery on fat intake was − 1.34 g/day (p = 0.006). This study demonstrates that bariatric surgery might be effective on energy and fat intake; however, there was no effect on carbohydrate intake.
KeywordsBody mass index Bariatric surgery Roux-en-Y gastric bypass Meta-analysis
Thanks to the reviewers whose input considerably strengthened the paper.
PJ and FS searched and wrote the paper; both of them separately did the exclusion and inclusion processes of articles, data extraction, and quality assessment. Any problem solved by ED. Sha analyzed data. ED commented on and edit the paper, also supervised the whole study.
Compliance with Ethical Standards
The present study is a systematic review and meta-analysis; therefore, informed consent was not needed.
Conflict of Interest
The authors declare that they have no conflict of interest.
The present study was approved and supported by Exceptional Talent Development Center (ETDC), Tehran University of Medical Sciences (grant no.: 97-03-61-39369).
- 4.le Roux CW et al. Gastric bypass reduces fat intake and preference. Am J Phys Regul Integr Comp Phys. 2011;301(4):6.Google Scholar
- 7.El Labban S, Safadi B, Olabi A. The effect of Roux-en-Y gastric bypass and sleeve gastrectomy surgery on dietary intake, food preferences, and gastrointestinal symptoms in post-surgical morbidly obese Lebanese subjects: a cross-sectional pilot study. Obes Surg. 2015;25(12):2393–9.CrossRefGoogle Scholar
- 36.Mechanick JI et al. American Association of Clinical Endocrinologists, The Obesity Society, and American Society for Metabolic & Bariatric Surgery medical guidelines for clinical practice for the perioperative nutritional, metabolic, and nonsurgical support of the bariatric surgery patient. Obesity. 2009;17(S1):S3–S72.CrossRefGoogle Scholar
- 38.Näslund I, Järnmark I, Andersson H. Dietary intake before and after gastric bypass and gastroplasty for morbid obesity in women. Int J Obes. 1988;12(6):503–13.Google Scholar