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Food tolerance and gastrointestinal quality of life, 2 to 4 years post-surgery are ostensibly best after SG, followed closely by RYGBP. AGB appears the least effective across these parameters. A significant positive relationship between food tolerance and gastrointestinal quality of life was confirmed.

In these patients, LSG resulted in pronounced weight loss at 1 year post-operatively, and most of this was maintained at 3 years. Nutritional deficiencies are prevalent among patients prior to bariatric surgery. These deficiencies may persist or exacerbate post-operatively. Routine nutrition monitoring and supplementations are essential to prevent and treat these deficiencies.

The control and AGB groups consumed significantly more high-calorie extra foods, a result that was paralleled by poor weight loss and food tolerance outcomes for the AGB group. A significant positive relationship between food tolerance and diet quality was established. Poor food tolerance and thus compromised diet quality need to be considered as post-surgical complications of the AGB procedure.