When one is in the countryside, when one walks under the trees and feels so close to Nature, to the trees, the sky, ... then one opens oneself, and by opening oneself communes with the universal forces.
What happens if one eats meat? ... In a greater or lesser proportion you swallow along with the meat a little of the consciousness of the animal you eat. It is not very serious, but it is not always very pleasant.
I knew a doctor who was a neurologist and treated illnesses of the stomach. He used to say that all illness of the stomach came from a more or less bad nervous state.