What is the vitamin that is poorly absorbed following a gastrectomy?

Following a gastrectomy, Vitamin B12 absorption is notably impaired due to the surgical removal of the stomach, which plays a crucial role in the absorption of this vitamin. The stomach produces intrinsic factor, a protein essential for the binding and absorption of Vitamin B12 in the intestines.

After gastrectomy, especially when the majority of the stomach is removed, the production of intrinsic factor is significantly reduced, leading to malabsorption of Vitamin B12. This can result in deficiency, which may present as megaloblastic anemia and neurological issues if not addressed.

While other vitamins such as A, D, and C also have their own specific absorption pathways and issues relating to gastrointestinal health, the association between gastrectomy and Vitamin B12 deficiency is well-documented and clinically significant, highlighting the importance of monitoring and potentially supplementing this vitamin in patients post-surgery.