Published online Nov 15, 2017. doi: 10.4239/wjd.v8.i11.464
Peer-review started: June 13, 2017
First decision: July 11, 2017
Revised: August 11, 2017
Accepted: September 4, 2017
Article in press: September 5, 2017
Published online: November 15, 2017
Core tip: Bariatric surgery is increasingly and successfully applied for the treatment of morbid obesity. In spite of multiple clinical benefits, i.e., durable weight loss and improvement/reversal of many comorbidities, a number of nutritional complications can develop especially in the long term, which could cause serious detriment to patients’ health. We examine some important clinical conditions that are caused by the deficit of vitamins and micronutrients, such as anemia, osteoporosis, and malnutrition. We also discuss the importance of careful pre-operative assessments and the correction of pre-existing nutritional deficiencies, and present the current recommendations for an appropriate biochemical and nutritional monitoring in the long term.