From a legal standpoint, nothing is food safe, unless it is documented as food safe.
From a practical standpoint, you can't trust colored PLA to be food safe, because you've got no idea what dyes and binders were added to it.
You might argue that natural PLA would be food safe, except that you can't guarantee that the guy who extruded the filament didn't just finish cleaning his extruder with MEK.
To be safe, you'll want to give the object a coat or two of food safe urethane.
