"as well as something called a trypsin inhibitor, which blocks the honeybees ability to break down proteins. "

All raw beans are very toxic.  That includes all the beans you routinely eat as well as soy beans.  In fact, near as I can tell soy beans are among the less toxic raw beans.  You can kill yourself by eating raw beans.  To imply that soy beans are unusually toxic amounts to a lie by omission.  Of course raw soy beans are toxic.  There is no new news in that statement.  Soy beans used to make soy bean flour or meal are processed to remove most of the oil.  This process can involve heating and expressing the oil in an extruder in which case the trypsin inhibitor in soy beans is destroyed and the meal is rendered safe to eat.  Or alternatively the oil can be solvent extracted which does not require cooking and the toxins can still be present.  The conclusion is the source of your soy bean flour makes a big difference.

How toxic are the soy bean derived complex sugars to bees?  Apparently not too bad according to this article unless you are dealing with caged bees:

J Nutr. 1977 Oct;107(10):1859-62.
Some carbohydrates found in pollen and pollen substitutes are toxic to honey bees.
Barker RJ.
Abstract
Carbohydrates in some pollen substitutes (galactose, lactose, raffinose, stachyose, glucuronic acid, galacturonic acid, polygalacturonic acid, and pectin) were toxic to caged adult Apis mellifera L. These toxins can be diluted to safe levels by sucrose. Collected nectar apparently dilutes the toxic sugars in pollen thus permitting assimilation of essential nutrients from pollen.

Dick

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html