Although breast-feeding has long been associated with lowered infant
morbid- ity and mortality from infectious disease, until relatively
recently little was known regarding the individual components of human
milk aside from their nutritive func- tions and the presence of
secretory antibodies. Over the last 40 years, and especially over the
last decade, evidence has been growing that human milk contains a large
number of materials that are bioactive and that are not found in
artificially formu- latedinfantdiets.
Disparatelinesofresearcharecurrentlyproducingsurprisinglylong
listsofnewlyrecognizedhumanmilkcomponents-antimicrobialsand immunomod-
ulators, includinganti-inflammatoryagents, antioxidants, cytokines,
andhormones- with biological activities that relate to pathogenesis,
inflammation, development, metabolic regulation, and other functions.
The sum of all of these biologically active milk components may account
for the strong protection that human milk affords nursing infants.
Strictly speaking, most components of human milk could be considered
bioac- tive, since nutrients are bioactive by definition. A major
emphasis of this book, how- ever, is on defining what is known about
components of human milk that inhibit common pathogens of the infant,
those that have hormonal and/or cytokine activity, those that have
immunomodulatory and/or anti-inflammatory activity, xenobiotics, and
nutrients that are uniquely essential to early development. The topic of
bioactive substances in human milk was explored in depth at the th 8
International Conference of the International Society for Research on
Human Milk and Lactation (ISRHML) held at Plymouth, Massachusetts,
October 25-29, 1997. This book contains the proceedings of that
conference.