小李的哥哥颇嗜杯中之物,平日里经常与朋友三日一小饮,五日一大聚,尤好以腌鱼腌肉下酒,且每饮必醉。不料,近来上腹部感到疼痛不适,日益消瘦,日前被医生确诊为胃癌。至此,年届不惑的他才如梦初醒、后悔不已,一家人也终日忧心忡忡。这天,小李特地来到肿瘤医院王医生的家,请教有关胃癌的防治知识。在详细地了解了小李的哥哥日常生活习惯和病情之后,王医生说:"目前医学研究已经证实,饮食中的 N-亚硝基化合物是强致癌剂。民间习惯食用的腌制和熏制的鱼肉、猪肉中,含有的大量硝酸盐,食用后经口腔细菌 Xiao Li’s elder brother is quite fond of things in the cup. He often drinks with friends for three days a week, and a big gathering on the 5th. He especially picks up kippers to drink and drinks, and every drink must be drunk. Unexpectedly, the upper abdomen has recently experienced pain and discomfort and has become increasingly thin. Recently, it was diagnosed by the doctor as gastric cancer. At this point, he was awake at the beginning of the year and regretted it. The family was worried all day long. On this day, Xiao Li came to Dr. Wang’s home at the Cancer Hospital to ask about the prevention and treatment of gastric cancer. After a detailed understanding of Xiaoli’s brother’s daily habits and illness, Dr. Wang said: “At present, medical research has confirmed that the N-nitroso compounds in the diet are strong carcinogens. Fish, pork, contains a large amount of nitrate, oral bacteria after eating