Will I Have Blood Related Problems After Gastric Bypass Surgery

You are about to undergo a very serious and life changing operation. Yet, your question discloses a serious lack of understanding of what you are about to have. I strongly urge you to have this and ALL questions you may have fully answered by your surgeon. As a summary, there are MANY surgical ways in which surgeons can change your intestines to bring about weight loss. They can be divided into one of 3 classes: - RESTRICTIVE (the stomach is made much smaller not allowing a large food... more

Gastric bypass, depending upon the type you have, changes the way your body absorbs nutrients.  Some nutrients are needed to prevent anemia and other things, like vitamin deficiencies.  Your surgeon should review your postoperative dietary and supplement needs in detail, so you can prevent or treat any potential problems.  The benefits of massive weight loss are so great that they tend to overshadow potential complications. 

You should discuss and have a full understanding of this prior to surgery. Generally the risk of this is low and may be more related to the risk of transfusion. Malabsorption syndromes can occasionally produce iron deficiency anemia or pernicious anemia.