Bad eating habits are easy to cause cancer. With the development of China's reform and opening-up economy, people's diet structure and habits have changed greatly. The proportion of cereals, beans and potatoes in the dietary structure decreased obviously, while the intake of animals and oils increased. Excessive consumption of pork, beef and mutton will increase the risk of colon cancer and kidney cancer.

Excessive intake of animal fat and protein can increase the incidence of endometrial cancer and ovarian cancer; Eating too much salt, smoked, dried, fried and other processed foods is closely related to the occurrence of cancers in the oropharynx, esophagus, stomach and pancreas, nasal cavity and throat of the digestive tract.

For example, Icelandic residents eat smoked mutton and smoked salmon all the year round, and more than 50% of cancer deaths in their population are patients with gastric cancer. Data show that eating too hot food can make oral mucosa hyperemia, injury and ulcer, while rough food and eating too fast can cause mechanical stimulation to esophageal mucosa, which may be one of the causes of esophageal cancer.

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