Intestinal permeability and inflammation mediate the association between nutrient density of complementary foods and biochemical measures of micronutrient status in young children: results from the MAL-ED study.

Journal Article (Journal Article)

Background

Environmental enteric dysfunction (EED) is thought to increase the risk of micronutrient deficiencies, but few studies adjust for dietary intakes and systemic inflammation.

Objective

We tested whether EED is associated with micronutrient deficiency risk independent of diet and systemic inflammation, and whether it mediates the relation between intake and micronutrient status.

Methods

Using data from 1283 children in the MAL-ED (Etiology, Risk Factors, and Interactions of Enteric Infections and Malnutrition and the Consequences for Child Health) birth cohort we evaluated the risk of anemia, low retinol, zinc, and ferritin, and high transferrin receptor (TfR) at 15 mo. We characterized gut inflammation and permeability by myeloperoxidase (MPO), neopterin (NEO), and α-1-antitrypsin (AAT) concentrations from asymptomatic fecal samples averaged from 9 to 15 mo, and averaged the lactulose:mannitol ratio z-score (LMZ) at 9 and 15 mo. Nutrient intakes from complementary foods were quantified monthly from 9 to 15 mo and densities were averaged for analyses. α-1-Acid glycoprotein at 15 mo characterized systemic inflammation. Relations between variables were modeled using a Bayesian network.

Results

A greater risk of anemia was associated with LMZ [1.15 (95% CI: 1.01, 1.31)] and MPO [1.16 (1.01, 1.34)]. A greater risk of low ferritin was associated with AAT [1.19 (1.03, 1.37)] and NEO [1.22 (1.04, 1.44)]. A greater risk of low retinol was associated with LMZ [1.24 (1.08, 1.45)]. However, MPO was associated with a lower risk of high transferrin receptor [0.86 (0.74, 0.98)], NEO with a lower risk of low retinol [0.75 (0.62, 0.89)], and AAT with a lower risk of low plasma zinc [0.83 (0.70, 0.99)]. Greater nutrient intake densities (vitamins A and B6, calcium, protein, and zinc) were negatively associated with EED. Inverse associations between nutrient densities and micronutrient deficiency largely disappeared after adjustment for EED, suggesting that EED mediates these associations.

Conclusions

EED is independently associated with an increased risk of low ferritin, low retinol, and anemia. Greater nutrient density from complementary foods may reduce EED, and the control of micronutrient deficiencies may require control of EED.

Full Text

Duke Authors

Cited Authors

  • McCormick, BJJ; Murray-Kolb, LE; Lee, GO; Schulze, KJ; Ross, AC; Bauck, A; Lima, AAM; Maciel, BLL; Kosek, MN; Seidman, JC; Ambikapathi, R; Bose, A; John, S; Kang, G; Turab, A; Mduma, E; Bessong, P; Shrestra, SK; Ahmed, T; Mahfuz, M; Olortegui, MP; Bhutta, Z; Caulfield, LE; MAL-ED Network Investigators,

Published Date

  • October 2019

Published In

Volume / Issue

  • 110 / 4

Start / End Page

  • 1015 - 1025

PubMed ID

  • 31565748

Pubmed Central ID

  • PMC6766446

Electronic International Standard Serial Number (EISSN)

  • 1938-3207

International Standard Serial Number (ISSN)

  • 0002-9165

Digital Object Identifier (DOI)

  • 10.1093/ajcn/nqz151

Language

  • eng