Thank you Emiliano and Al for these comments. I think you are technically correct that there is a degree of spalting that would be safe for salad bowl use.....however, for my own purposes, I believe I'll continue to rule out using spalted woods for food use. To me, the thought is to err on the safe side being the more prudent philosophy.....especially since I have paying customers who could make life difficult for me, if they understand that spalting is a decaying process.
I will be updating the original post to include your comments about toxic woods, and extremely porous woods shortly......thanks.
John......Yes......thick walls is the way I turn my salad bowls, too. Seems like the only option, when extreme durability is the object.
I have a walnut salad bowl in process right now......but, I do have some reservations about it. If I'm recalling this correctly, I believe I've heard someone, somewhere, comment that walnut transfers a "noticeable taste".......but, I don't know if I'm recalling that correctly.

Anyone have a comment about that?
-----odie-----