> >Don't mix two proteins. This is too hard to digest.
> Any idea of the reason for this?  Is it the proteins themselves or the fats,
> sugars or other things they are packaged with?

I have no detailed data but I suppose that the body has to produce
excretes for the digestion of any food. AFAIK it does so very exactly.
And it gets problems when two ore more products are eaten at the same
time or too short after the other.

It gets real bad (usually) if one eats fruits or fruity vegetables in
one meal with protein, especially RAF.

Karl