Vitamin B12 absorption is far more intricate than previously understood, involving a precisely coordinated seven-step biochemical pathway that spans multiple organ systems. Recent research published in the American Journal of Clinical Nutrition reveals that failure at any single stage can result in deficiency, even when dietary intake appears sufficient.
This complexity explains why millions experience B12 deficiency despite consuming adequate amounts through food sources. The process requires coordination between the stomach, pancreas, small intestine, and transport proteins—each step critical to success. Understanding these mechanisms is transforming how clinicians approach diagnosis and treatment, moving beyond simple dietary recommendations to targeted interventions addressing specific absorption failures.
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