Portion size after 5 years of Bariatric Gastric Sleeve surgery?

Will the portion sizes consumed before the surgery return back after 5 years of surgery?. If I maintain a healthy diet and exercise routine and take care not to stretch the sleeve or pouch for 2 years will I go back to the pre-surgery portion size in the future?. In case of weight gain will it be difficult to lose weight as it was before surgery or will the surgery be helpful to lose the weight gained a few years post the surgery as well? Will the restrictive nature w/o ghrelin help to lose wt?

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