> Soy flour contains two types of sugars (stachyose & raffinose) that are actually toxic to bees as well as something called a trypsin inhibitor, which blocks the honeybees ability to break down proteins. Essentially, your bees get a short boost from the feed, but soy flour eventually ends up dragging them backwards.

Not a paraphrase, of course, but a direct quote from the MegaBee website. It has been known for 40 years or more that some sugars are toxic to honey bees, based on work by Barker, et al. However, the second part "ends up dragging them backwards" is conjectural. In fact, Barker found:

Toxicity is reduced when honey bees have plenty of nectar or when these carbohydrates are diluted to under 4% with 50% sucrose solution (Barker, 1977*).

* Barker R.J. (1977) Some carbohydrates found in pollen and pollen substitutes are toxic to honey bees, J. Nutr. 107, 1859–1862.

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