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An Efficient Single-Person Technique for Milk Sampling from Laboratory Mice
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Lactating women restricting milk are low on select nutrients.

Cynthia A Mannion1, Katherine Gray-Donald, Louise Johnson-Down

  • 1School of Dietetics and Human Nutrition, McGill University, Montreal, Quebec, Canada. cmannion@ucalgary.ca

Journal of the American College of Nutrition
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Lactating women restricting milk intake experienced lower protein and nutrient levels. Vitamin and mineral supplements improved calcium and vitamin D intake for these women, but milk restriction is not advised.

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Area of Science:

  • Nutrition Science
  • Dietary Studies
  • Lactation Research

Background:

  • Lactating women have no specific vitamin/mineral supplementation guidelines.
  • Milk is a key source of nutrients during lactation.
  • Some lactating women restrict milk intake for various reasons.

Purpose of the Study:

  • To assess nutrient adequacy in lactating women.
  • To compare dietary intake, including supplements, between milk restrictors and non-restrictors.

Main Methods:

  • 175 exclusively breastfeeding women were divided into milk restrictors (RS) and non-restrictors (NRS).
  • Dietary intake (24-hr recalls) and supplement use were recorded for six months postpartum.
  • Nutrient intakes were compared to Estimated Average Requirement (EAR) and Adequate Intake (AI) levels.

Main Results:

  • 23% of women restricted milk intake.
  • Milk restrictors (RS) had lower protein, calcium, and vitamin D intakes compared to non-restrictors (NRS).
  • Supplementation improved calcium and vitamin D levels in RS, but their intake remained lower than NRS.

Conclusions:

  • Milk restriction (<250 mL/day) negatively impacts protein and nutrient intake in lactating women.
  • Vitamin/mineral supplements can partially mitigate deficiencies in calcium and vitamin D for milk restrictors.
  • Milk restriction during lactation is discouraged; alternative sources or supplements are necessary if unavoidable.