Drinking lukewarm water is enough for cold and fever, because during the period of cold and fever, there is a tendency of fluid shortage due to heavy sweating and excessive urination, so a lot of water is needed. Moreover, because of the risk of hypokalemia due to profuse sweating and excessive urination, it is clinically recommended to use potassium-rich foods or fruits, such as bananas, oranges, tangerines, and so on. It is also recommended to consume more fresh vegetables and fruits, as these foods also contain a large amount of minerals and vitamins, which can improve the immunity of the patient and promote the recovery of the disease. Foods high in protein, sugar, salt and grease are not recommended during a cold. Foods high in protein may lead to gastrointestinal symptoms and increased gastrointestinal burden, which may lead to nausea and vomiting, while consumption of foods high in sugar, salt and grease may lead to increased respiratory symptoms.