Naturopathy places primary importance on diet. It believes that accumulation of morbid matter in the digestive system is the root cause of most diseases, and that cleansing the system through fasting can eliminate this morbid matter. Diet is classified into eliminative, soothing, and constructive phases to cleanse, soothe, and rebuild the body. Foods are also classified as producing acidic or alkaline ashes, and the diet should consist of 80% alkaline-forming foods to prevent acidosis. Personality and health are influenced by the tamasic, rajasic, or sattvic qualities of one's diet.