Dear Heather:

Regarding your search for a reference to an opioid-like substance in a
formula -- I just this morning read an on-line article, "Constituents of
Human Milk" by Ann Prentice, found at

http://www.unu.edu/unupress/food/8F174e/8F174E04.htm

which briefly noted "casomorphins, opioid-like substances that may
affect infant behaviour and mood in addition to a range of other
functions, are produced in the baby's intestines by the degradation of
breastmilk casein."

backed up with a citation to:
Schusdziarra V. Physiological role of beta-casomorphins. In: Picciano
MF, Lonnerdals B. eds. Mechanisms regulating lactation and infant
nutrient utilization. New York: WileyLiss, 1992:33748.

Hope this helps.

I haven't had a chance to read the rest of the site, from a
"Breastfeeding: Science and Society" conference, convened by the
Pontifical Academy of Sciences and The Royal Society, in Vatican City in
May 1995.  But the table of contents,
http://www.unu.edu/unupress/food/8F174e/8F174E00.htm#Contents
looks intriguing, with discussion of work by Woolridge, Hartmann and
some other well-known researchers.  (Sorry that this is old news to many
of you, but there's lots of us playing catch-up here!)

Margaret Wills

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