As far as the ingredients used in the Homebrew diet, the two components of
interest would be the Brewtech yeast and the toasted soy flour (brand
not specified).
We California beekeepers have a long history of feeding Brewtech yeast,
which is well taken by bees.
I just searched for mesh size for soy flour. By definition, it must be
ground to at least 100 mesh (149 micron). Cargill's soy flour is 200 mesh
(74 micron).
Bees easily consume 74 micron pollens, so a 200-mesh flour should be fine.
Randy Oliver
Grass Valley, CA
530 277 4450
ScientificBeekeeping.com
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