Human immune cells can be divided into two types, one is "army" type cells that protect the human body from invasion, and the other is "police" type cells that maintain internal law and order. The former is to achieve anti-virus infection through an antigen-antibody reaction. It usually takes a certain amount of time to react; the latter is also known as natural killer cells (NK cells). One million new cells are born in the human body every day, of which there are about 5,000 bad cells. They may cause canceration. NK cells can Early detection and attack of these bad cells and infected cells, research has confirmed that R-1 lactic acid bacteria in yogurt can increase NK cell activity. Can it be launched from this? ['Lack of NK cells will lead to cancelation of some human cells.', 'Against the flu, yogurt even works faster than drugs.', '"Army" type immune cells are more resistant to infection.', '"Police" immune cells help the body fight cancer.']