Reported excess weight loss after bariatric surgery could vary significantly depending on calculation method: a plea for standardization

For a given postoperative weight loss, significant variance will be found in the %EWL (≤17%), depending on the definition of IBW used and the preoperative weight value used. This highlights the need for a standardized approach for reporting weight loss in bariatric studies. Investigators should define their methods clearly, and readers should keep this variability in mind when interpreting the %EWL.