# Early-Life Exposure to Acid-Suppressive Therapy and the Development of Celiac Disease Autoimmunity

## TL;DR

This study finds that early-life use of acid-suppressive therapy may be linked to celiac disease autoimmunity, but the connection might be due to healthcare habits rather than a direct cause.

## Contribution

The study highlights potential confounding by healthcare utilization in linking acid-suppressive therapy to celiac disease autoimmunity.

## Key findings

- Cohort study found a significant association between acid-suppressive therapy and celiac disease autoimmunity.
- Test-negative case-control study found no significant association between the two.
- Results suggest the observed link may be due to healthcare behavior rather than a causal relationship.

## Abstract

Is acid-suppressive therapy during early life associated with the development of celiac disease?

This study included both a cohort design and a test-negative case-control design. Acid-suppressive therapy was associated with celiac disease autoimmunity only in the cohort study of 79 820 children and not in the test-negative case-control study of 24 684 children.

This study suggests that the association between early-life use of acid-suppressive therapy and development of celiac disease is suspected to be confounded by health care utilization behavior.

Early-life use of acid-suppressive therapy has increased over the past 2 decades. Although these medications are widely used, recent studies showed an association between early-life use of acid-suppressive therapy and various long-term outcomes, including celiac disease.

To assess the association between early-life use of acid-suppressive therapy and the risk of celiac disease autoimmunity using 2 observational approaches on a large population-based database.

The cohort study took place in Israel using Maccabi Healthcare Services data. The data were collected on December 8, 2023, and were initially analyzed from January to May 2024. Analysis of the data continued during the revision rounds that took place from October 2024 to February 2025. Children born between January 1, 2005, and December 31, 2020, were included, grouped based on their exposure to acid-suppressive therapy within the first 6 months after birth and subsequently followed up for outcome development until the age of 10 years or December 8, 2023. A retrospective matched cohort design (N = 79 820) and retrospective matched test-negative case-control design (n = 24 684), including only the population tested for celiac disease autoimmunity, were used separately and compared.

Prescription purchase of acid-suppressive therapy, either proton-pump inhibitors or histamine-2 receptor antagonists, during the first 6 months of life.

Celiac disease autoimmunity was defined as a positive anti–transglutaminase 2 enzyme-linked immunosorbent assay test result according to the thresholds of the commercial kits used. Time to first positive result for celiac disease autoimmunity was defined as the outcome in the cohort design, and acid-suppressive therapy use was defined as the outcome in the test-negative design.

The cohort design included 79 820 children (41 319 boys with no acid-suppressive therapy use [51.8%]; median birth year, 2015 [IQR, 2011-2018]), of whom 19 955 (25.0%) used acid-suppressive therapy. The rate of celiac disease autoimmunity was significantly higher among children using acid-suppressive therapy than among those not using acid-suppressive therapy (1.6% [310 of 19 955] vs 1.0% [610 of 59 865]; P < .001). The adjusted hazard ratio of acid-suppressive therapy use for development of celiac disease autoimmunity was 1.52 (95% CI, 1.33-1.74). In the test-negative case-control design, a total of 24 684 children were included (62.2% girls; median birth year, 2012 [IQR, 2009-2016]), of whom 6176 (25.0%) were celiac disease autoimmunity positive. The rate of acid-suppressive therapy users among those who tested positive for celiac disease autoimmunity was not significant compared with those who tested negative (5.0% [309 of 6176] vs 4.6% [858 of 18 508]; P = .25). The adjusted odds ratio of a positive celiac disease autoimmunity test for acid-suppressive therapy use was 1.07 (95% CI, 0.94-1.23), which was nonsignificant compared with the population that tested negative.

This retrospective study included both cohort and test-negative case-control designs. In the cohort design, acid-suppressive therapy was significantly associated with celiac disease autoimmunity. In the test-negative case-control design, this association was not significant. These results suggest a residual confounding by health care utilization in cohort designs studying celiac disease and suggest a noncausal association between acid-suppressive therapy and celiac disease autoimmunity.

This study uses both a cohort design comprising 79 820 children and a test-negative case-control design comprising 24 684 children to assess the association between early-life use of acid-suppressive therapy and the risk of celiac disease autoimmunity.