In some hospitals, to counter some illnesses, dogs are used to assist sufferers to fight the diseases. Dogs can calm an agitated mind and inspire a sense of well-being, which promotes the ability to fight disease.

If mainstream medicine is using dogs as instruments of healing, I'd say it's pretty well established that there is a connnection between mind and body where health is concerned.

A logical extrapolation would be that an extremely tranquil, well-ordered and disciplined mind might be able to purge its body of maladies, or might be less likely to have maladies.