Many street fried food used to fry the raw materials are not hygienic, many fried raw materials are fast or already bad. In addition, the oil they use is also unhygienic, and many poor street vendors often use gutter oil to fry food. There are also some vendors who use qualified cooking oil, but in order to save costs, they often heat the oil repeatedly at high temperatures to make the grease scorched and blackened, which undoubtedly increases the content of carcinogens and harmful substances. In addition, because fried food is cooked at high temperatures in a very short period of time, often outside the fried yellow (paste) hard inside but not cooked, not only did not effectively kill pathogenic microorganisms in the food, easy to intestinal parasites and other diseases.

2. Lead to obesity

Most fried food is high-fat food, not conducive to digestion, not only affect your stomach and intestines, but also lead to obesity.

3. Produce toxic and harmful substances

The repeated high-temperature heating of fats and oils will produce toxic and harmful substances. Because of the repeated high temperature heating of fats and oils, the polymers produced by the unsaturated fatty acids in them after high temperature heating - dimers and trimers - are more toxic. Most fried and baked foods, especially french fries contain high concentrations of acrylamide, commonly known as c-toxin, is a carcinogen.

4. Nutrients are seriously damaged

Food fried at high temperatures, in which a variety of nutrients are seriously damaged. High-temperature protein frying char deterioration and reduce the nutritional value, high temperature will also destroy the fat-soluble vitamins in food, such as vitamin A, carotene and vitamin E, preventing the body from absorbing and utilizing them.

5. Aluminum content is seriously excessive

Many people often eat breakfast oil, oil cake. But because of the addition of a relaxing agent - alum and make the aluminum content are seriously excessive. Excessive intake of aluminum will be harmful to the human body, aluminum and acid and alkali can react, after the reaction of the formation of compounds, easy to be absorbed by the intestinal tract, and can enter the brain, affecting the intellectual development of children, and may lead to Alzheimer's disease. In addition, do the dough when the doughnut after alum treatment, high alkalinity, so that the loss of vitamin B1.

6. induced disease

Fried food fat content, not easy to digest, often eat fried food will cause indigestion, as well as satiation of chest fullness, and even nausea, vomiting, diarrhea, loss of appetite and so on. People who often eat fried food, due to the lack of vitamins and water, easy to fire, constipation.

In addition, deep-frying is to put the food in boiling oil to make it ripe, while oil frying is to put a little oil in the pot, and then put the food, etc. in the pot, heated from time to time to flip to make it ripe or dry, the two cooking methods are different.