"Foreign fast food" has the characteristics of three highs (high calorie, high fat and high protein) and three lows (low minerals, low vitamins and low dietary fiber). Nutritionists have nicknamed "foreign fast food"-energy bomb and junk food. Because eating a foreign fast food is equal to the lower limit of your daily energy consumption. It is conceivable that if your child eats bombs every day, can this child be healthy? American congressmen, nutritionists and consumer associations claim that obesity, like smoking, has become a public health problem, calling for "driving fast food out of campus". In June 2002 +2002 10, a child who was obese because of eating foreign fast food for a long time in new york took McDonald's to court, claiming that it caused childhood obesity. From June 5438 to October 29, 2003, New Scientist magazine published in London reported that foreign fast food would cause hormonal changes in the body and cause addiction. Professor Michael Schwartz, an endocrinologist at the University of Washington, found that fast food (hamburgers, fried potato chips, etc. ) will cause changes in hormones in the body, making it difficult for consumers to control their food intake. The article said: "The discovery of biological effects of fast food is of explosive significance, and the cause of obesity cannot be attributed to the fact that obese people have no self-control ability." The oil used in some "foreign fast food" is different from the common vegetable oil traditionally used in China, because it is hydrogenated oil, that is, the oil produced by hydrogenation of vegetable oil. Professor willett, director of the Department of Nutrition, School of Public Health, Harvard University, pointed out in 199 1 that hydrogenated oil produced by hydrogenation of natural vegetable oil is harmful to health! Because hydrogenated oil contains some trans fatty acids that do not exist in nature, trans fatty acids will affect the endocrine system of human body and endanger health. Willett pointed out: "Epidemiological studies on the relationship between the intake of hydrogenated fat and the risk of heart disease and diabetes show that hydrogenated fat is worse than saturated fat". Foreign fast food and carcinogen -C poison. On April 24, 2002, the Swedish National Security Bureau announced the latest research results, and found that French fries, hamburgers, biscuits, roast pork and so on contained a lot of acrylamide. Because acrylamide damages the central nervous system and can induce benign or malignant tumors, some scholars believe that this explains the high incidence of tumors in western countries. On March 24, 2004, the US Food and Drug Administration announced the inspection results of 750 kinds of foods, which once again confirmed that French fries, potato chips, popcorn and fried chicken had the highest carcinogen content.