In particular the best traffic on ASDLC preceded the time that
low carb was a fad.  Turning into a fad was *not* a good thing
for low carbing - Before the fad it was a popular dieting style
with a popularity that had been growing slowly from the 1970s
(or earlier) on.  Expertese grew gradually and steadily.  After
the fad there are millions who now remember it as a fad that
came and went.

The fad was not a completely bad event.  It triggered more
metabolic studies.  Some low/lower carb products that were
introduced during the fad were pretty good (low carb ketchup)
and some are still on the shelves (wheat intolerant guy
laments that all lower carb wraps and breads and such are
wheat based).  But to me the net negatives of the fad time are
greater than their net positives.

For a large number of reasons.  But the best expertese remains
on those UseNet groups that remain active and the FAQ files
for so many newsgroups remain superior to any other material
I've ever seen on various topics.  The low carb FAQ file, as good
as it is relative to other low carb material, isn't as good as a bunch
of FAQs on other topics.  UseNet FAQ files are just amazing in
their quality and the information in most of them does not age
quickly.