I have been involved in a scientific investigation of consciousness studies for many years, and actually acquired by Doctorate in the subject of Spiritual Metaphysics.
A peaceful environment creates a calm mind and a relaxed body. The mind can cognise and perceive, and allow the individual to pursue healthy lifestyles, or unhealthy lifestyles, but there is no legitimate scientific evidence that it can change physical chemistry by an ‘act of will’. Malfunctioning Body chemistry is altered by medicine, change of lifestyle habit, or change of environment, and nothing else. People get better because their body chemistry changes, and not because they think ‘nice’ thoughts.