Apple has cooling thermal nature, sweet-and-sour flavor. It reduces heat, especially summer heat and, creates fluids for the body in general, but particularly to moisten dryness and cool heat in the lungs—protects the lungs from cigarette smoking; stimulates appetite. Apple also has the property to remedy indigestion—this ability is due in part to the presence of malefic and tartaric acids in apples, which hold back the growth of ferments and disease-producing bacteria in the digestive tract. It contains pectin, which removes cholesterol, toxic metals such as lead and mercury, and the remains of radiation. This fruit is beneficial for low blood sugar conditions and emotional depression associated with it. A poultice of grated apple over the eyes for twenty minutes helps relieve inflammation and irritations such as sunburn or a eye disorder called "pink eye." Apples and their juice are also cleansing and favorable for the liver and gallbladder by softening gallstones.