Autoimmune gastritis - PMC - PubMed Central (PMC)
www.ncbi.nlm.nih.gov › pmc › articlesSep 26, 2016 · Vitamin B12 deficiency in AIG is not only caused by loss of intrinsic factor if parietal cells are destroyed, but is also due to loss of gastric acid, which is needed for release of the vitamin from food sources. Pernicious anemia is a rather late finding in AIG and diagnosed mainly in elderly patients . This might be explained by minimal ...