Andrew,

>>Ben, what are the main food sources of N-acetylneuraminic acid, and
what is
its function in the body?<<

I'm currently at work on a more comprehensive description of all the
saccharides, their functions, and their sources, in response to a
question from Dedy. I'll be posting the full explanation soon. But, in
the interim, to give you a short version for N-acetylneuraminic acid,
here is a synoptic view from Dr. Mondoa's book:

" N-Acetylneuraminic acid is particularly important for brain
developement and learning. It is, not surprisingly, abundant in mother's
breast milk. Animal studies indicate that this essential saccharide also
improves both memory and performance. In addition, it's an immune
modulator that affects the viscosity of mucus, which in turn,repels
bacteria, viruses, and other pathogens. In several in vitro and animal
studies, the saccharide has been shown to inhibit strains of influenza A
and B viruses more effectively than such prescription antivirals as
amantadine and ribavirin. It also influences blood coagulation, brain
development, and cholesterol levels, lowering LDL, the so-called bad
cholesterol. The processing of this sugar is disturbed in Sjogren's
syndrome and in alcoholics. In general, levels of this saccharide
decrease as we age."

The food sources for this saccharide are , in general, certain edible
fungi, mushrooms, human breast milk, certain fruits and vegetables,
unprocessed grains, roots, and plants such as aloe vera.The varied
sources for saccharide rich foods will be discussed in more detail soon,
as I respond in fuller detail to Dedy's question.

Best regards,

Ben in seattle