Micronutrient deficiencies in older patients with inflammatory bowel disease are not associated with worse adverse clinical outcome rates

Background: Micronutrient deficiencies (MNDs) and age have been previously separately associated with adverse clinical outcomes in patients with inflammatory bowel disease (IBD). However, previous clinical outcomes in older patients with MNDs have been poorly described. We examined the age-related rates of adverse clinical outcomes in patients with 1 or more MNDs. Methods: We conducted a single-institution retrospective cohort study of 204 patients with IBD. Patients were divided into age-related cohorts: 1) younger adults aged 18-59; and 2) older adults aged ≥60 years. Patients were further delineated based upon the presence of zinc, vitamin D, vitamin B12, folate, and iron deficiency. We examined the age-related associations between MNDs and adverse clinical outcomes. Primary outcomes included subsequent corticosteroid use, combined intestinal complication (intra-abdominal abscess, intestinal stricture, internal fistula, perianal disease), IBD-related surgery, IBD-related hospitalization, and a composite clinical outcome. Statistical analyses included the Wilcoxon rank-sum test, chi-squared analysis, Fisher's exact test, and logistic regression. Results: Vitamin D (61.5%), iron (46.4%), and zinc (40.5%) deficiencies were common in older IBD patients, but were not significantly more prevalent. Older patients with 1 or more MNDs did not experience increased rates of adverse clinical outcomes. However, vitamin D, iron, and having multiple MNDs were associated with adverse clinical outcomes in the younger cohort. Conclusions: Vitamin D, iron and zinc deficiencies are common in IBD patients. In younger patients, vitamin D, iron, and multiple MNDs were associated with adverse clinical outcomes, but the same trend was not seen with MNDs in older patients.