Originally Posted by winkless

A valuable thread of course...
Weight loss surgery patients most commonly experience deficiencies in two classes of vitamins, fat soluble vitamins and some B-vitamins. These vitamins are as follows:

Fat Soluble Vitamins: vitamins A, D, E and K
B-Vitamins: B-1, Thiamine, Folate, B-12

Due to the efficacy of oral vitamin supplementation and vitamin injections, revision weight loss surgery is rarely needed or used to treat conditions of vitamin deficiency. Deficiencies in fat soluble vitamins are most commonly found in Duodenal Switch patients with patients experiencing vitamin-D deficiency most frequently. Malnutrition and protein deficiency is treated by elongation of the common limb, which can also be performed to treat vitamin deficiency.