Impact of preoperative wait time due to insurance-mandated medically supervised diets on weight loss after sleeve gastrectomy. Are patients losing momentum?

Background: Few studies have examined whether preoperative period length, as defined by the amount of time from enrollment in a surgical weight loss program to the day of surgery, affects postoperative weight loss.

Objectives: To identify associations between preoperative period length and postoperative weight loss.

Setting: Single surgeon at an academic medical center in the United States.

Methods: Retrospective chart review in 109 consecutive patients undergoing sleeve gastrectomy from 2014-2015.

Results: When patients were grouped based on postoperative percentage of total weight loss, greater weight loss was associated with shorter preoperative wait time. During the preoperative period, 72.2% of our patients achieved a net weight loss, but 34.6% had gained net weight until they started the preoperative "liver-shrinking" diet; 71.4±8.3% of the total preoperative weight loss occurred after initiating the preoperative diet, which accounted for approximately 15% of the whole preoperative period length. There was no correlation between the length of the preoperative diet and preoperative weight loss.

Conclusions: Shorter preoperative periods and earlier initiation of liver reduction diets may increase postoperative weight loss, although ultimately there may be a limit to the weight loss that patients can achieve while adhering to highly restrictive lifestyle modifications.