The fourth zone regulates the digestion and assimilation of foods and the production of substance to keep the body in health. This zone is often found to be out of order in many cases.
When the fourth zone is out of harmony this is directly related to diet. If chemicals from foods, drinks or toxins are incorrectly combined there will be unpleasant reactions leading to discomfort and imbalances within the body.
Correcting the zone will be temporary. With poor diet digestive troubles will continue.