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Walnuts as an Infant Solid Food for Health

Walnut as a First Food During Complementary Feeding on Gut Microbiota and Immunity Development in Breastfed Infants

Who can join

5 Months – 5 Months · All sexes

Inclusion Criteria:

* Full term: gestational age ≥ 37 weeks
* Generally healthy without conditions that would affect normal growth
* No significant consumption of complementary food (e.g., no more than 1 oz of solid foods per week)
* Exclusively breastfed (\< 2 weeks of cumulative formula exposure)

Exclusion Criteria:

* Adults unable to consent
* Pregnant women
* Prisoners

About the study

The objective is to investigate the effect of walnuts on gut microbiota, inflammatory markers, atopic dermatitis status, and indices of allergy outcomes in breastfed infants during early complementary feeding.

The three primary aims include:

Aim 1: Evaluate the effect of walnut consumption on gut microbiota structure and function, inflammation, atopic dermatitis, and allergy outcomes.

Aim 2: Evaluate the impact of walnut consumption on infant growth trajectories and risk of overweight.

Aim 3 (exploratory): Identify walnut-specific food signatures that are associated with gut microbiota and immunity biomarkers using a novel nutri-metabolomics technique.

What is being tested

• Infant walnut intake (other)

Sponsor: Colorado State University · Participants: 90 · Started: May 18, 2025

Contact the study team

• Nathan Campbell, MS · Phone: 7655436716

Official record on ClinicalTrials.gov — NCT07081698

Locations in the U.S.

From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.