Final answer:
Option 1. Gastrectomy patients are at risk for vitamin B12 deficiency due to the lack of intrinsic factor, which is essential for its absorption. They require vitamin B12 injections post-surgery to prevent health issues.
Step-by-step explanation:
Gastrectomy patients are at risk for a deficiency of vitamin B12 (Cobalamin). The stomach produces intrinsic factor, which is essential for the intestinal absorption of vitamin B12. This nutrient is necessary for the production of mature red blood cells and normal neurological functioning. Without a stomach, patients cannot produce intrinsic factor, leading to a risk of vitamin B12 deficiency. Therefore, after a total gastrectomy, patients typically require vitamin B12 injections to maintain adequate health and prevent associated conditions like pernicious anemia.
Vitamin B12 is necessary for the production of mature red blood cells and normal neurological functioning. The intestinal absorption of vitamin B12 cannot occur without intrinsic factor, which is produced in the stomach. Therefore, when the stomach is removed through gastrectomy, patients need to receive vitamin B12 injections to avoid deficiency.