I truly think there is an energy connection because they are right in your body-- and everything has an energy field. I remember my old boyfriend putting his head near mine years ago-and I had to pull my head away because the energy he had was so negative.
He got offended, and I had to apologize, but I often marveled at how sensitive I was to that energy. because his head was right near mine- I could feel it.
Positive energy thoughts also create an alkaline environment very quickly--which worms hate. Negative thoughts and emotions quickly create an acid environment in the body which worms and disease loves.