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| CREDIT: Dreamstime |
Humans carry around loads of living bacteria
that are crucial for good health, and through breastfeeding, infants make some
of their first contact with beneficial microorganisms that will colonize their
body. Scientists have discovered that breast milk contains more species of
bacteria than originally expected — more than 700 varieties. The bacteria's exact role is still unclear,
but this microbial diversity could help the baby to digest the milk or to give
the infant's immune system a boost, researchers say. And further investigations
could lead to nutrition strategies for babies who cannot be breastfed.
The microbiome of breast milk was mapped out
using a DNA sequencing technique known as pyrosequencing, which generates
extremely large numbers of small DNA "tags" copied from the genes of
organisms being examined. Scientists can sort out different species by looking
at variations in DNA sequences that code for a molecule universal among all
living cells. Fort their study, researchers examined both
colostrum, which is the first secretion of the mammary glands after birth, and
breast milk from one to six months after birth. The latter samples contained
bacteria typically found in the mouth, such as Veillonella, Leptotrichia and
Prevotella, the scientists found. "We are not yet able to determine if
these bacteria colonise the mouth of the baby or whether oral bacteria of the
breast-fed baby enter the breast milk and thus change its composition,"
researchers María Carmen Collado of the Institute of Agrochemistry and Food
Technology and Alex Mira of the Higher Public Health Research Center, both in
Spain, said in a statement.
Among other findings of the study, the breast
milk of overweight mothers and of mothers who have a planned caesarean contains
a lesser diversity of bacteria species. (Mothers who have an unplanned
caesarean have a breast milk composition is very similar to that of mothers who
have a vaginal birth, the researchers noted.) "If the breast milk bacteria discovered
in this study were important for the development of the immune system, its
addition to infant formula could decrease the risk of allergies, asthma and
autoimmune diseases," the authors conclude. The results have been
published in the American Journal of Clinical Nutrition.
Source: Live Science
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