Ibn Qayyim in "Medicine of the Prophet" said, "Quince is cold and dry, constipates and benefits the stomach. Sweet quince is cold and dry and is somewhat mild. Sour quince constipates more than sweet quince and is colder and drier. All types of quince quench the thirst, stop vomiting, help produce urine and constipate. Consuming quince before the meal constipates, while consuming it after the meals softens the stool and helps the digestion process … quince jam strengthens the stomach and the liver and relieves the heart and the soul.”