Question: Why doesn't the electricity from our bodies go into the ground?

Josh Meyers answered on 18 Jun 2015:

The electricity in our bodies is produced by the flow of ions in and out of our cells. This movement of charged particles generates a difference potential that is used to generate the electronic pulses used to signal instant responses from other parts of the body.

The simple answer to your question is that we do not produce enough energy to lose significant amounts of it to the ground. Most of the energy we produce remains within the body, mainly confined to nerve cells. The fatty sheaths which surround nerves help to contain the charge.

However some of the electricity does escape. This is how sharks can sense heartbeats in the ocean!