Inadequate stomach acid levels can lead to a range of digestive and nutritional problems. For instance, insufficient gastric acid can hinder the proper denaturing of proteins, affecting protein digestion and potentially increasing food allergenicity. This environment also impairs the activation of pepsin, essential for optimal protein breakdown, and reduces the absorption of crucial micronutrients like calcium, iron, and several B vitamins. Moreover, reduced stomach acid compromises the body's ability to eliminate harmful ingested microorganisms, increasing the risk for conditions such as small intestinal bacterial overgrowth (SIBO) and infections from bacteria like Clostridium difficile.
Although the direct consequences of low stomach acid are well recognized, there is less consensus on how widespread this condition is, how best to diagnose it, and the most effective treatments.
The debate over the prevalence and impact of low stomach acid (hypochlorhydria) also extends to the discussion around treatment, particularly regarding the role of acid supplementation in digestion. Traditional medical views suggest that most healthy individuals produce sufficient stomach acid, yet "functional hypochlorhydria," or low acid during meals, appears to be more common, especially in older adults and those frequently using acid-suppressing medications. The integrative medicine community often employs an empirical approach to diagnose and manage low stomach acid, using increasing doses of betaine HCl during meals to determine the right level for symptom improvement. This method, though widely used and supported by positive anecdotal evidence, has yet to be rigorously validated in clinical research, highlighting a gap between clinical practice and established scientific evidence.
Guilliams, Thomas G, and Lindsey E Drake. “Meal-Time Supplementation with Betaine HCl for Functional Hypochlorhydria: What is the Evidence?.” Integrative medicine (Encinitas, Calif.) vol. 19,1 (2020): 32-36.
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