Impact of pre-bariatric surgery weight loss has been shown to facilitate the surgical procedure in terms of reducing the liver mass allowing the surgeons to elevate the left liver lobe to expose the gastroesophageal junction easily for a Roux-en-Y Gastric bypass or to access the stomach easily for a sleeve gastrectomy. Pre-surgical weight loss is also beneficial in aiding the patients in improving the quality of their diet to accustom their eating habits post-surgery. However, the impact of pre-surgical weight loss on post-surgical weight loss in patients is not widely studied. Hence, we aim to study the impact of pre-bariatric surgery weight loss on post-surgery weight loss.


Pre-operative data and up to 3 years post-surgical data were obtained from bariatric patients between 2014 to 2016 and observed weight loss profiles were analyzed retrospectively. The mean pre-surgical weight loss was 1.8kg. Patients who lost 1.8kg or more were deemed as having significant weight loss. Patients who lost less than 1.8kg were seen as having insignificant weight loss. For the significant group and insignificant groups, mean percent weight loss before surgery was similar at -1.6% and -1.5% respectively, mean percent weight loss 1 year after surgery were -21.6% and -20.7% respectively while mean percent weight loss 3 years after surgery were -5.9% and -14.5% respectively.


pre-surgical weight loss does not impact greatly on post-surgical weight loss, on observation of individual data sets, the patients’ lifestyle may have an even greater impact on their weight loss profiles in the long run.