They will be. Sorry for the short detour back into physics. That's an example of how easily romanced we are by the physical. Let's get even more subtle. A study at Duke University in 1997 found that thoughts leading to negative emotions like anger or sadness actually constrict the blood vessels of the heart, a condition known as ischemia.
Ischemia starves the flow of energy to the muscle and is a precursor to heart attack.
There you have it. Holding on to a negative thought about someone or something blocks energy flow. A positive thought reduces risk. Metaphysicians are aware of many more examples. Stress is factually aligned with disease and illness.