Spirit in Taoism called Yuan spirit or Yuan Shen （元神）or we can also call it Shen, is the superior host of the body. Traditional Chinese Medicine and Taoism believe that the Shen could govern the Qi, the Qi could govern the Body. All treatment approaches have to ensure the wellbeing of Shen, otherwise all the effort will be fruitless. Zhang Zhong Jing also believed that treatments should be favorable to the Shen. In the abstinence of external diseases in 《Shang Han Lun 》, it suggests to stop consuming meat, five stinky vegetables, decaying and stinky items. The acupuncture points called Welcome Fragrance (LI20) which are located above the mouth signifies that all the food should be smelled by our nose before they could be entered into our mouth. Ancient Chinese showed their wisdom by creating Chinese words with intrinsic value. As a point in large intestine meridian, it implies that our body especially our stomach and intestine prefer fragrant food instead of stinky food. Our body which is governed by spirit is welcoming fragrant food and dislike smelly food which could generate pathogens like bacteria, viruses, worms. The stinky smell could impair the Shen and energy Yang. This correlate with several modern studies which had found out that the structure and the digestive acid of human is incapable to overcome the virus and bacteria. The result shown that we could treat and prevent the Covid 19 and other contagious diseases by stop consuming the stinky food.