And I paraphrase; 
 
"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."

This is the first I've heard of this.  
Comments? 

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