According to traditional Chinese health preservation, onion is a mild nature, sweet and pungent in flavor. It has the effects of invigorating stomach, promoting digestion, soothing liver, moistening intestines, removing phlegm, diuresis and inducing sweating, and it is a rare health-preserving food. Onion has the effect of killing bacteria and treating colds and nasal congestion. People with neurasthenia can put onions beside their pillows, which can improve sleep. Here are 3 dietary therapy methods of onion to introduce to everyone.