The milk study protocol: A longitudinal, prospective cohort study of the relationship between human milk metabolic hormone concentration, maternal body composition, and early growth and satiety development in Samoan infants aged 1-4 months

PLoS One. 2024 May 10;19(5):e0292997. doi: 10.1371/journal.pone.0292997. eCollection 2024.

Abstract

Background: Current research suggests that energy transfer through human milk influences infant nutritional development and initiates metabolic programming, influencing eating patterns into adulthood. To date, this research has predominantly been conducted among women in high income settings and/or among undernourished women. We will investigate the relationship between maternal body composition, metabolic hormones in human milk, and infant satiety to explore mechanisms of developmental satiety programming and implications for early infant growth and body composition in Samoans; a population at high risk and prevalence for overweight and obesity. Our aims are (1) to examine how maternal body composition influences metabolic hormone transfer from mother to infant through human milk, and (2) to examine the influences of maternal metabolic hormone transfer and infant feeding patterns on early infant growth and satiety.

Methods: We will examine temporal changes in hormone transfers to infants through human milk in a prospective longitudinal cohort of n = 80 Samoan mother-infant dyads. Data will be collected at three time points (1, 3, & 4 months postpartum). At each study visit we will collect human milk and fingerpick blood samples from breastfeeding mother-infant dyads to measure the hormones leptin, ghrelin, and adiponectin. Additionally, we will obtain body composition measurements from the dyad, observe breastfeeding behavior, conduct semi-structured interviews, and use questionnaires to document infant hunger and feeding cues and satiety responsiveness. Descriptive statistics, univariate and multivariate analyses will be conducted to address each aim.

Discussion: This research is designed to advance our understanding of variation in the developmental programming of satiety and implications for early infant growth and body composition. The use of a prospective longitudinal cohort alongside data collection that utilizes a mixed methods approach will allow us to capture a more accurate representation on both biological and cultural variables at play in a population at high risk of overweight and obesity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adiponectin / blood
  • Adiponectin / metabolism
  • Adult
  • Body Composition*
  • Breast Feeding
  • Child Development / physiology
  • Female
  • Ghrelin / blood
  • Ghrelin / metabolism
  • Humans
  • Infant
  • Infant Nutritional Physiological Phenomena
  • Leptin / blood
  • Leptin / metabolism
  • Longitudinal Studies
  • Male
  • Milk, Human* / chemistry
  • Milk, Human* / metabolism
  • Mothers
  • Prospective Studies
  • Satiation / physiology

Substances

  • Leptin
  • Adiponectin
  • Ghrelin

Grants and funding

VH has received funding for this project from the Wenner-Gren Foundation: Dissertation Fieldwork Grant, the MacMillan Center International Dissertation Fellowship, the Smith Fund, and the Yale Institute for Biospheric Studies Graduate Research Fund to support data collection and analysis. Infrastructural support is provided by NIH grants R01HL093093 (PI: McGarvey) and R01HL140570 (PIs: McGarvey & Delany). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.