Body composition and metabolic changes following bariatric surgery


A quick summary about interesting research results in regard to basal metabolic rate differences in pre and post-operative bariatric surgery patients.

Body composition analysis using convenient, clinical-grade bioelectrical impedance analysis (BIA) technology can provide clinicians and researchers accurate, medically-validated measurements of patient basal metabolic rate (BMR), percent fat, fat mass in absolute values, and lean body mass among others.

These measurements are very helpful to know prior to surgery, with a view to post-surgical care, planning and nutrition counseling. A recent study looked at the Analysis of Variance using the general linear model with a research cohort of bariatric patients1. Prior to surgery the baseline values were measured in a rapid, non-invasive manner by means of BIA.  After  surgery the same measurements of BMR, fat mass and lean mass were taken at intervals of 1, 3 and 6 months. The resulting analysis showed significant changes in all body composition measures, including lean body mass, and an average reduction in BMR for the cohort in a range of 330-440 kcal one month after surgery.  This is an expected and significant reduction in BMR, and points to it being helpful to measure a patient’s score in regard to post-surgical nutrition counseling as it applies to total daily caloric intake.  Subsequent measures at the 3 and 6-month intervals showed no significant changes in BMR, indicating no adaptation of an energy-conservation mechanism in the cohort patients.



1Body Composition and Metabolic Changes Following Bariatric Surgery: Effects on Fat Mass, Lean Mass and Basal Metabolic Rate  Daniel Gene Carey, German J Pliego, Robert L Raymond, Kelley Brooke Skau  Obesity Surgery April 2006, Volume 16, Issue 4, pp 469-477

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