<prompt> Gastrectomy produces deficiency of which vitaminVitamin B6Vitamin B12Vitamin B2Vitamin B1  <response>: Gastrectomy produces deficiency of Vit B12.In contrast to other water-soluble vitamins, significant amounts4-5mg of vitamin B12are stored in the body. As a result, it may take several years for the clinical symptoms of B12deficiency to develop in individuals who have had a paial or total gastrectomywho, therefore, become intrinsic factor-deficient, see p. 377 and can no longer absorb the vitamin.1. Reference: Lippincott Textbook of Biochemistry pg no. 376 