Background Atrophic gastritis (AG) and use of proton pump inhibitors (PPIs) result in gastric acid suppression that can impair the absorption of vitamin B-12 from foods. The crystalline vitamin B-12 form, found in fortified foods, does not require gastric acid for its absorption and could thus be beneficial for older adults with hypochlorhydria, but evidence is lacking.
Objectives To investigate associations of AG and PPI use with vitamin B-12 status, and the potential protective role of fortified foods, in older adults.
Methods Eligible participants (n = 3299) not using vitamin B-12 supplements were drawn from the Trinity-Ulster and Department of Agriculture cohort, a study of noninstitutionalized adults aged≥60 y and recruited in 2008–2012. Vitamin B-12 status was measured using 4biomarkers, and vitamin B-12 deficiency was defined as a combined indicator value < −0.5. A pepsinogen I:II ratio <3 was considered indicative of AG.
Results AG was identified in 15% of participants and associated with significantly lower serum total vitamin B-12 (P < 0.001) and plasma holotranscobalamin (holoTC; P < 0.001), and higher prevalence of vitamin B-12 deficiency (38%), compared with PPI users (21%) and controls(without AG and nonusers of PPIs; 15%; P < 0.001).PPI drugs were used (≥6 mo) by 37% of participants and were associated with lower holoTC concentrations, but only in participants taking higher doses (≥30mg/d). Regular, compared with nonregular, consumption of fortified foods (i.e.,≥5 and 0–4 portions/wk, respectively) was associated with higher vitamin B-12biomarkers in all participants, but inadequate to restore normal vitamin B-12status in those with AG.
Conclusions Older adults who have AG and/or use higher doses of PPIs are more likely to have indicators of vitamin B-12 deficiency. Fortified foods, if consumed regularly, were associated with enhanced vitamin B-12status, but higher levels of added vitamin B-12 than currently provided could be warranted to optimize status in people with AG.
- Vitamin B12 biomarkers
- atrophic gastritis
- proton pump inhibitor drugs
- fortified foods
- food-bound malabsorption
- older adults