Do not cook in high-temperature
"Oil" is that people will eat every day, so its science use is essential to human health, if used improperly, over time and may even cause cancer.
Many people like cooking stir in a high temperature, accustomed to smoke before cooking oil, this approach is unscientific. High-temperature oil will not only destroy the nutritional content of food, but also produce some peroxide and carcinogenic substances. The proposed first pot hot, then pour the oil, you can stir-fry, do not wait until the oil smoke.
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