The effect of nutrition on sleeve gastrectomy patients’ weight loss, biochemical measurements, and comorbids: A clinical study

Dallı Şen S., ERDEM N. Z.

Nutrition and Health, 2023 (Scopus) identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2023
  • Doi Number: 10.1177/02601060231186847
  • Journal Name: Nutrition and Health
  • Journal Indexes: Scopus, ASSIA, BIOSIS, CAB Abstracts, CINAHL, EMBASE, Food Science & Technology Abstracts, MEDLINE
  • Keywords: comorbidity, fat mass, nutrition, Obesity surgery
  • Istanbul Medipol University Affiliated: Yes


Background: This study investigates the effect of a nutrition program applied to patients as per bariatric surgery protocol at the sixth month postoperative. The study also compares and contrasts the postoperative findings with preoperative data. Methods: Twenty severely obese sleeve gastrectomy patients between the ages of 18–65 participated in the study. Energy requirements were calculated as 22 kcal/ideal body weight (kg/day) and protein requirements as 1.5 g/ideal body weight (kg/day). The study evaluates patients’ anthropometric and biochemical measurements, body mass index, waist circumference, fat mass (%), weight loss (%), excess weight loss (%), comorbids, and dietary habits at the third and sixth months preoperative and postoperative. Patients’ daily macro-micronutrient intake was also calculated. The Friedman Test and Cochran's Q test were performed to determine statistically significant data (p < 0.05). Results: During the first 6 months postoperative, patients lost 34 kg of weight and 16.7% of fat mass, and their percent excess weight loss was measured at 60.2% (<0.0001). Biochemical measurements of the patients revealed that fasting blood glucose, low-density lipoprotein cholesterol, total cholesterol, triglyceride, and calcium levels, which were above the reference range in the preoperative period, were within this range in the postoperative period (<0.0001). Thirteen out of 21 comorbidities, including type 2 diabetes, hypertension, hyperlipidemia, pulmonary problems, and sleep apnea, improved at different rates in the sixth month postoperative. Conclusions: Thanks to the nutrition program applied as per bariatric surgery protocol, patients lost weight, and their biochemical measurements and comorbids have improved following sleeve gastrectomy.