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Nygaard, K., Helsingen, N. & Rootwelt, K. 1970. Adaptation of Vitamin B12 Absorption after Ileal Bypass. Scand. J. Gastroent. 5, 349-351.Vitamin B12 absorption from the intestine was measured using Schilling test preoperatively and at 3 months and 12 months postoperatively. Ileal bypass caused a marked reduction of vitamin B12 absorption, which recovered significantly between 3 and 12 months after operation, indicating an adaptation of absorption of vitamin B12 during the period.
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Nygaard et al. (1970) studied this question.
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