...just why some ferrets with slow onset insulinoma don't show
symptoms till the blood results are rather shocking?

This mentions some research studies, some of which may hint at just why
that is:

<http://blogs.scientificamerican.com/scicurious-brain/2011/11/21/sfn-neuroblogging-hypoglycemia-and-brain-function/>

List members, be sure to use the entire URL minus the < and > if you
transcribe it by hand or by copying. Meanwhile those bordering marks
should encourage Yahoogroups' computers to leave in the whole thing as
one continuous address.

[Posted in FML 7261]