Let's just say this again: Everyone here watched this video because their science teacher told them to and the video helped them a lot and everyone thanks MooMoo Math and Science. That's basically the summary of all the comments here...
As much as I love this video and how asks fun questions, the pickle is set up to fail. Pickles are indeed conductors but you have it set up to short out. Try it again with only two leads connected to the pickle and you will see that it is a conductor.
I think your food circuits are set up incorrectly. Pickles are excellent conductors. If you connect both of the power source’s negative and positive clips to the pickle the electrons will flow directly from the source’s negative clip to the source’s positive clip rather than through the pickle. That’s why only one end of the pickle is lighting up. I’d be interested in your results when you have the positive clips connected away from the pickle as you did when you tested the metal objects.
vegetables' setup is shorted~ they are deemed to fail. you can notice how the pickle glows and smokes only beteween the ground and phase pins, that is because current "choses the shortest path" here's another fact, even insulators can conduct under some conditions such as having a high enough voltage, or being in a very low temperature or in a low pressure easiest example would be air in a tesla coil, the tesla coil provide such high voltage that it makes arcs, which are a form of current chosing the easiest path through air to reach its discharge target.
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