Seeing as we are all self-assumed "professionals" on the subject this thread will go around in circles unless by some coincidence a canine nutritionist pops by.
Steve, you can find a tonne of information if you Google "fruit on empty stomach". Of course you will find all sorts of varying information on the internet (like any other topic these days).
I see I did say fruits and veggies...it's just fruits. I didn't mean to put veggies there. My thoughts are not with the forums these days...
For the record, when I fed raw I used a "Prey Model + brown rice" diet, not BARF (Bones And Raw Food- raw food being small amount of fruits and veggies, but still no grains or carbs). Some people will also do BARF + brown rice, or just Prey Model. I found my dog needed some carbs to burn off (I chose cooked brown rice) or she would become too lean on the raw diet (read: very skinny).