Starting at a very young age I would cut food into bite sized pieces. To this day I won’t just bite into an apple, peach or pear, although I will sometimes make an exception for a plum. None of that was my point though, my point was that all synthetic lubricants have a vile taste, so use them sparingly. If you’re using a folding knife a lot for food and cleaning it frequently, maybe better to use vegetable oil as it has little flavor.
I prefer a fixed blade for most food work, but sometimes all I’ve got is a folder.