Eating and living with cancer patients will not be infected. Cancer is a malignant tumor, but it is not an infectious disease, so it will not be infected to normal people. Even if some cancer cells will enter normal people with saliva when eating, most of the tumor cells will be swallowed by stomach acid and will not enter human body. Even if they enter human body through damaged oral mucosa or gastrointestinal mucosa, they will be swallowed by normal immune system of human body and cannot survive in normal human body. Cancer has a lot to do with bad daily living habits and diet structure. If you eat and live with a cancer patient, it is better not to get involved in the bad living habits and diet structure of the cancer patient before, otherwise it will increase the chance of getting cancer.