According to Professor Zhang Wanqi from the Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, the researchers randomly selected 97 food business units in this city and took 120 samples from 20 kinds of fried foods such as plain rolls, fried dough sticks, gluten and French fries, and investigated the oil absorption rate of these foods, that is, the oil content and the harmful substances contained in them. Through investigation, it was found that the oil absorption rate of fried fruit grate was the highest, reaching 45.23%, followed by fried nuts, fried dough twists, gluten, fried chicken wings, fried oil cakes and so on, and the fried fish steak with the lowest oil absorption rate reached 8.24%.

Another indicator of this test is the polar component in frying oil, which is a harmful substance produced by the deterioration of edible oil during frying food. Through testing, it was found that the polar components in frying oil of fried chicken chops, fried steaks, fried chicken wings and French fries were the highest. According to China's regulations, the allowable intake of polar components per day is 7.7 mg/kg, and the allowable intake of polar components per person per day is 0.462 based on 60 kg body weight. Therefore, this time, the experts calculated the total amount of polar components that each person can eat every month on the basis of 30 days per month, divided by the polar component content and oil absorption rate of 20 kinds of fried foods, and calculated the total amount of fried foods that can be eaten every month. For example, you can only eat 863.43 grams of fried dough sticks, which everyone loves very much. If you eat one or two times a month, you can only eat 17 times a month at most. Others like gluten can be eaten seven times a month, French fries can be eaten eight times, and the least fried chicken wings can only be eaten four times a month.

Experts said that according to calculations, more than half of the 20 kinds of fried foods tested this time should not be eaten more than 10 times a month, that is, it is safer to eat once every three days. However, if it is used more than two times each time, 42% of the varieties must be eaten more than once a week to be safe. Moreover, the safe intake level calculated this time is only on the premise of eating one kind of fried food. If you eat several kinds of fried foods at the same time, the safe intake level will drop.

Experts remind the public that in the process of frying food, oil is repeatedly used at high temperature for a long time, and the longer the frying time, the greater the quality damage. This test only studied the safety of fried food from polar components. In fact, repeatedly fried oil may also produce many other carcinogenic and mutagenic harmful substances, which are very harmful to human health after eating. For those who often eat fried food, while enjoying the "delicious food", it also brings hidden dangers to their health. The more fried food you eat, the more fat your body will absorb. However, the recommended intake of cooking oil per person per day by China Nutrition Society is only 25g, that is, two tablespoons. 100 g of vegetable oil has a calorie as high as 900 kcal. When high-calorie food reaches the body, it will turn into fat and be stored in the spleen, viscera and blood, leading to vascular diseases and coronary artery sclerosis, which will obviously increase the risk of obesity, hyperlipidemia, diabetes, cardiovascular diseases and malignant tumors.

Oil content or oil absorption rate and safe intake level of common fried foods

Oil content or oil absorption rate of fried food varieties Content of polar components of fried oil Total amount of fried food that can be eaten every month 1 times of eating every two months.

Plain coil18.7%12.9% 604.3g12

Vegetarian meatballs18.8%12.0% 693.6g12.

Fried cake 8.6%18.9% 823.4g16

Fried nuts 42.2% 1