Re: Why do some foods act as a conductor and other foods act as insulators?

Only two types of materials conduct at room temperature those with mobile 
electrons (metals and graphite) and those with mobile ions (some foods).
Acidic foods like lemons and oranges have a lot of acid (citric acid) in 
them which provides the ions which can conduct the electricity. Other 
foodstuffs havelittle or no free ions so cannot conduct. Acids produce 
Hydrogen ions H+ and are found in many foods.