Weight Loss following Gastric Bypass

Approximately 60-70% of excess weight can be lost if the general rules pertaining to exercise and diet are followed postoperatively. Some weight regain is commonly seen at 18 months but sustained weight loss in the order of 50% of excess weight loss is generally seen at 5 years and beyond.

Most weight loss is seen in the first 12 months. Sometimes it can be precipitous which is not of concern as long as vitamins and adequate protein, 60-80g, per day are taken.

Sometimes patients plateau for periods and do not lose weight. This may last from a few weeks to longer but weight loss resumes as long as the correct diet and exercise recommendations are being followed.

If sudden weight gain occurs then xrays may need to be taken to see if the staple lines have disrupted. This is generally seen at a later date and the incidence has reduced now that the stomach is divided between staple lines.