There is usually no such thing as long-term bread consumption causing cancer. Although bread contains certain ingredients such as preservatives and flavors, the content is relatively small and usually meets the standards for consumption. Therefore, there is no need to worry too much. As bread is mainly made of flour, eggs, sugar, salt and other raw materials and seasonings, which contain certain carbohydrates and protein, moderate consumption, not only will not have a greater impact on the body, but also to supplement the body with certain nutrients, but also to increase the sense of satiety. In addition, although the bread is relatively delicious, but still need to control the intake, mainly because some bread for color and aroma, will add a lot of cooking oil, butter and sugar, if long-term eating bread and excessive consumption, may lead to weight gain, blood sugar, blood lipid elevation. And long-term eating bread, may also lead to a reduction in the body’s intake of other foods, so that the body’s nutritional intake is not balanced and cause other nutrient deficiencies. Therefore, no matter what kind of food you eat, you should eat reasonably and avoid overeating. The causes of cancer are mostly considered to be related to genetic, environmental and dietary factors. The clear carcinogens include aflatoxin, Helicobacter pylori, benzo(a)pyrene, etc., while bread generally does not contain clear carcinogens. Balanced nutrition, reasonable diet, moderate exercise, adequate rest and regular medical check-ups should be carried out in daily life to reduce the risk of cancer development.