Bariatric surgery nutrition guidelines have not yet addressed body composition analysis. To formulate potential body composition goals, 12 months' weight and body composition outcomes following sleeve gastrectomy (SG) were examined and compared to published Roux-en-Y Gastric Bypass outcomes.
Methods:
Post-SG data from an acute-care institution were prospectively collected for 156 women and 38 men, compliant with preoperative plus 3-, 6-, and 12-month postoperative visits. Variables' changes and rates of change were examined within and between genders. Preoperative assessments included weight, body mass index, and body composition utilizing ElectroLipoGraphy®. Postoperatively, their changes plus weight loss (WL), percent excess weight loss (%EWL), and percent lean lost [%Lean Lost = (lean mass [LM] loss/WL) × 100] were evaluated.
Results:
Both genders lost significant weight, primarily from fat mass (FM) transitioning %Body Fat (%BF) below each gender's obesity threshold. For both genders, all variables except women's %Lean Lost significantly changed. Weight, %BF, LM, and WL demonstrated significant between-gender difference in Y-intercepts and means but not slopes.
Conclusions
: For both genders, SG accomplishes significant WL by encouraging FM loss and LM sparing. Outcomes suggest potential %BF and LM-sparing goals applicable to both surgeries that are gender specific, necessitated by most variables' significant gender differences.
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