Objective:
To assess the effect of daily egg consumption for six months on linear growth (primary outcome), weight-for-age, weight-for-length, mid-upper arm circumference-for-age, and head circumference-for-age Z-scores, gross motor milestones development, anaemia, and iron status (secondary outcomes) in a low socioeconomic community.
Participants/ Setting:
Infants aged 6 to 9-months living in peri-urban Jouberton area, in the Matlosana Municipality, South Africa.
Design:
A randomised controlled trial with a parallel design was implemented. Eligible infants were randomly allocated to the intervention (n = 250) receiving one egg/day and the control group (n = 250) receiving no intervention. The participants were visited weekly to monitor morbidity and gross motor development, with information on adherence collected for the intervention group. Trained assessors took anthropometric measurements, and a blood sample was collected to assess anaemia and iron status. There was blinding of the anthropometric assessors to the groups during measurements and the statistician during the analysis.
Results:
Baseline prevalence of stunting, underweight, wasting, overweight and anaemia was 23.8%, 9.8%, 1.2%, 13.8%, and 29.2%, respectively, and did not differ between groups. Overall, 230 and 216 participants in the intervention and control groups completed the study, respectively. There was no intervention effect on length-for-age, weight-for-age, weight-for-length Z-scores, gross motor milestone development, anaemia, and iron status.
Conclusions:
Daily egg intake did not affect linear growth, underweight, wasting, motor milestones development, anaemia, and iron status. Other interventions are necessary to understand the effect of animal-source food intake on children’s growth and development. This trial was registered at https://clinicaltrials.gov/ (NCT05168085).