Stomach acid plays a more critical role in nutrient absorption than many clinicians recognize. Beyond its digestive function, gastric acid serves three essential roles: it denatures proteins to release mineral-bound nutrients, enables iron and calcium absorption through ionization, and creates pH conditions necessary for nutrient bioavailability. This explains a clinically significant phenomenon—patients with reduced gastric acid production often develop micronutrient deficiencies despite possessing anatomically intact, fully functional intestines. Conditions causing hypochlorhydria, including proton pump inhibitor use and atrophic gastritis, can lead to B12, iron, and calcium malabsorption. Clinicians evaluating patients with unexplained deficiency states should assess gastric acid production, as restoring normal pH conditions may resolve nutritional insufficiencies without requiring aggressive supplementation strategies.
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