It looks to me like we're hitting on 2 different but related areas of this
thread on food components entering mom's milk.  Ann says,

Cruciferous vegetables and fruits make a by product of s-methyl - L cystine
sulfoxide.  This by product can enter mom's plasma and therefore into her
breastmilk.  This will happen within 20 minutes of ingesting these foods.

I thought the original subject was food that entered mom's milk and caused
allergic type symptoms, but that might have been my own personal
interpretation of the post (sorry I don't remember original poster).  This
reference, from a talk on colic and fussiness, may or may not be allergy
related.  Certainly allergic responses make babies fussy (that's an
understatement in my dd's case!) but the aforementioned are "gas byproducts"
which would cause gas and fussiness by themselves, not as part of an
allergic response.  Am I wrong in drawing this distinction?  Just as some
things in moms can cause gas in her and baby, they don't cause an allergic
reaction.  Thus, the 20 minute response time for symptoms wouldn't hold true
for allergic responses.  I was thinking I read that these symptoms showed
up, on average, 12 to 24 hours after ingestion of the offending food by the
mother.  Don't know  what that says about when it actually shows up in the
milk and also can't find my source for that tidbit.  I can tell you from
experience that my daughter's allergic symptoms showed up exactly in that
window, between 12 and 24 hours.  Conversely, it took 2 full weeks for all
symptoms to disappear when the food was eliminated and I'm guessing it would
only take at most a day or so for symptoms to subside if the cause (being
gas-forming foods, like beans, broccoli, or those types of things) were
eliminated.  Not sure I'm making sense but I would be surprised if babies
reacted that quickly -20 minutes- to something the mother ate.

Marsha, who is in that fog after lunch and may not be thinking clearly.

~~~~~~~~~~~~~~~~~~~~~~~~~~~
Marsha Glass RN, BSN, IBCLC
Mothers have as powerful an influence over the welfare of future generations
as all other earthly causes combined.
John S. C. Abbot
~~~~~~~~~~~~~~~~~~~~~~~~~~~

             ***********************************************
The LACTNET mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software together with L-Soft's LSMTP(TM)
mailer for lightning fast mail delivery. For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html