• Child with resection of ileum (which is responsible for absorption of the ) who presents with macrocytic anemia, most consistent with vitamin B12 deficiency
• Key idea: To remember the sections of small intestine and pertinent nutrient absorbed in each, use mnemonic Iron Fist Bro for Iron (duodenum), Folate (jejunum) and B12 (ileum)
• Key idea: Ileum also responsible for absorption of bile salts, which are responsible for fat absorption and absorption of fat-soluble vitamins (A, D, E and K)

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