Among those I talk to, it has always been assumed that over-drying causes pollen to lose its sweet taste.  It is well accepted that bees mix pollen with nectar during the collection process and that "fresh" or "fresh frozen" pollen is quite sweet tasting.  However, pollen that is "crunchy" (most pollen found in stores) is quite bitter and those I talk to have assumed that both the "crunchy" and the bitter is related to over drying.   

I have confirmed the relationship by accidentally over drying pollen, with the expected results.

Several weeks ago someone suggested that this relationship should not exist as drying should do no more than remove moisture, leaving behind any sugars.  So...over dried pollen might be crunchy, but should not be bitter.  Sounds right to me.

Anyone have any idea why over dried pollen is, in fact, bitter to the taste?

Lloyd
Lloyd Spear, Owner of Ross Rounds, Inc.
Manufacturer of round comb honey equipment and Sundance pollen traps