A study conducted on the impact of pre surgery weight loss on post-surgery weight loss. The results indicated that people who had advised weight loss before surgery had experience enormous weight loss after three months of router-en-Y gastric bypass as compared to those who had not received weight loss instruction. But the difference was not statistically significant in both groups at 6 month or 1 year after surgery. Meanwhile the study has some limitation, there was no intervention related to

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... ifestyle modification and only one method of surgery was introduced hence it minimized the specificity of findings. Among extremely obese patients nonsurgical interventions such as behavioral lifestyle was administered to them and they had loss 5-10% of initial body weight recommended it potential utility as a pre-surgery intervention. Some initial results indicated that behavioral lifestyle intervention has positive relation with greater weight loss than those who did not had special care before surgery. The intervention group had reported more weight loss and was ore prone to lose at least 5% as compared to regular care group. This study has concluded that pre-operative lifestyle interventions improves weight loss following bariatric surgery. Opposite to this statement the intervention group lost significantly less weight at 2 years after operation, although the difference between groups was modest. Due to study inclusion criteria, the results may not generalize to individuals with more severe obesity, medically compromised patients, or other subgroups who could potentially achieve health benefits from pre-surgery lifestyle change. For post-surgery weight loss and health benefits of bariatric surgery there must be some behavioral, surgical or pharmacological interventions initoated in this period.