Seems to me that these authors chose to overlook the fact that the primary source of phytochemicals found in pollen and propolis are, in fact, pollen and propolis - not honey. Makes me wonder if this effect would be seen in bees fed a diet that includes more than straight sugar. I agree that and natural and diverse diet including, honey and pollen, likely a better source of food for the bees than anything we feed them, but I can't think of a situation where a bees would not be able to have any pollen, propolis, or honey (the conditions in this experiment).

Cheers- E

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