The influence of preoperative fat distribution on post-bariatric surgery body mass index and body weight loss.

Background: The body weight following bariatric surgery is a primary concern for both healthcare professionals and surgical candidates. However, it remains unclear whether variations in preoperative fat distribution influence weight loss outcomes.

Objective: The aim of this study was to evaluate the effect of abdominal fat distribution on postoperative weight loss and body mass index (BMI) reduction, and to clarify the role of different fat depots in weight loss outcomes.

Methods: Preoperative data from patients with overweight or obesity, along with their weight records at 1, 2 and 5 years following surgery, were retrospectively collected. Multiple levels of abdominal fat areas were measured using computerized tomography imaging. Statistical analyses included Pearson's correlation coefficients, multiple linear regressions, ridge regressions, decision tree regressions and paired t tests to evaluate the associations and influences.

Results: A total of 139 patients were initially included. The statistical analysis results indicated that umbilical subcutaneous adipose tissue (SAT) was an independent factor influencing weight and BMI loss at the 1-year follow-up (n = 67, p < 0.01). Furthermore, umbilical SAT demonstrated significant correlations with sustained BMI reduction over the long term.

Conclusion: Umbilical SAT is a significant factor in postoperative weight and BMI loss. Patients with greater SAT may experience more substantial weight and BMI reductions following surgery, offering new insights into personalized weight loss strategies and alternative approaches for assisted weight loss.