Abstract

BALLESTEROS POMAR, M. D. et al. Effects of preoperative weight loss with a very low calorie diet (VLCD) on weight loss after biliopancreatic diversion in patients with severe obesity. Nutr. Hosp. [online]. 2013, vol.28, n.1, pp.71-77. ISSN 1699-5198.  https://dx.doi.org/10.3305/nh.2013.28.1.6265.

Background: Weight loss before bariatric surgery, achieved by means of a very low calorie diet (VLCD) has been recently reported to be related to a lower rate of postoperative complications. However, it is controversial if preoperative weight loss after VLCD could improve postoperative weight loss. Aims: To assess the effectiveness of a preoperative VLCD for 6 weeks in weight loss one year after bariatric surgery. To evaluate the changes obtained in anthropometric measures and biochemical parameters after VLCD. Methods: Prospective uncontrolled study including severely obese patients undergoing biliopancreatic diversión in our Obesity Unit in 2008-2010. Patients included followed a VLCD providing 840 kcal and 60 g of protein (Optisource^®). Descriptive data are presented as mean (standard deviation) and after checking a normal distribution is followed, they were analyzed by Student s T test, ANOVA or Pearson correlation. Results: We evaluted 107 obese patients, 43.5 (10.2) years-old, 72% women, with initial weight 122.4 (18.6) Kg and BMI 46.8 (5.5) kg/m². 24.5% of them lost more than 10 % of initial weight and 73.5% more than 5% after following VLCD. Mean percentage of excess weight loss (% PSP) one year after surgery was 59.6 (13.4)%, and although it was higher for those patients losing more weight after VLCD, a significant correlation was not found: those who lost more than 5% showed %PSP 59.5 (13.8) % after twelve months and 68.4 (16.2) % of percentage of excess BMI loss (%PEIMC), vs 57,9 (13,1) % and 68.5 (16.6) % if they didn t lose that amount of weight. Those patients losing more than 10% achieved %PSP 63.3 (13.7) and %PEIMC 70.9 (14.7) vs 58.2 (14.0) y 67.7 (16.7) vs those not losing that amount. Significant correlations between preoperative loss with VLCD and %PSP or %PEIMC at 3,6,9 and 12 months were not found, only %PSP 1 month after surgery correlated with %PSP after VLCD (r = 0.454, p = 0.003). Conclusions: Preoperative weight loss with VLCD in severely obese patients did not show to improve either %PSP or %PEIMC one year after bariatric surgery.

Keywords : Obesity; Morbid obesity; Severe obesity; VLCD (very low calorie diet); Bariatric surgery.

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