Causes of B12 deficiency,”Pernicious anemia (most common in the West) GastrectomyPoor diet (vegetarian), EtohismCrohn disease

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Causes of B12 deficiency,”Pernicious anemia (most common in the West) GastrectomyPoor diet (vegetarian), EtohismCrohn disease

ileal resection (terminal ileum)Diphyllobothrium latumBlind loop syndrome”