This was discussed at length in Norway, when they introduced 0.2 promille for driving. I seem to recall that, if you eat 2 loafs of freshly baked bread, yes you can get a level of alcohol in your blood. Same if you, like a moose (elk), eat 20 kilo of half rotten fruit.
In general, a normal healthy person, on a normal diet will not produce any alcohol.
A number of intakes may give a false positive on a breath test, but will not show up on a blood test. Indeed, if your breath test is in doubt, the police in Norway will wait for 30 minutes, and then perform a new test. If still around the limit, a blood test will be taken. This will normally take care of mouth rinse, candy with some alcohol in it, etc. The traffic police that is, don't know how they would handle a pilot with 0.2.
It's a sad world if the rest Danny is hinting at, is true.
