Second, the oil in the dish is unclear and the color is turbid. It is estimated that it is inferior oil that has been used many times, because the color of the oil will gradually become darker during heating.
Third, fresh and qualified vegetable oil is smooth and easy to flow, without greasy feeling. When you wash it in water, it's easier to wash off the oil. The gutter oil tastes sticky and has no refreshing feeling, and it is difficult to wash off even in hot water. You can also drop a few drops of oil on your fingers and rub them back and forth with your fingertips. If there is a sticky feeling, it is very likely to use waste oil.
4. Pack the vegetables and take them home, put them in the refrigerator and take them out a few hours later. If the oil has solidified or semi-solidified, it means that the quality of the oil is poor, or animal oil such as lard is used, and the content of trans fatty acids and saturated fatty acids is high. Eating too much of this oil is bad for the heart.
5. Eliminate food allergies. If you feel uncomfortable after eating, or have stomach pains, diarrhea and other gastrointestinal diseases, it is probably because you have eaten inferior oil.
Extended data:
Harm of waste oil
First, indigestion
In the cooking process, waste cooking oil undergoes a series of chemical changes such as rancidity, oxidation and decomposition after pollution, resulting in substances that are highly toxic to human body; Arsenic is one of them. Once people use "waste oil" containing a lot of arsenic, it will cause symptoms such as indigestion, headache, dizziness, insomnia, fatigue and discomfort in the liver area.
Second, diarrhea.
The cooking process of gutter oil is doomed to be unsanitary. Once a large number of harmful microorganisms such as bacteria and fungi reach people's intestines, it will cause diarrhea, and in severe cases, it will cause a series of gastrointestinal diseases such as nausea and vomiting.
Third, abdominal pain.
Waste oil is mixed with a lot of sewage, garbage and detergent. After extraction in the underground workshop, bacteria and harmful chemical components cannot be removed at all. It is an indisputable fact that all "gutter oil" will have a serious lead content exceeding the standard. Eating food made from "gutter oil" with excessive lead content will cause serious abdominal cramps, anemia, toxic liver disease and other symptoms.
Fourth, gastric cancer and intestinal cancer.
The disgusting refining process is the cause of the breeding of gutter oil toxins. "Waste edible oil" is a refined oil made from swill (swill, leftovers, etc.). ) and waste edible oil collected from hotels and restaurants to remove odor and flow to the edible oil market. Gutter oil contains aflatoxin and benzopyrene, both of which are carcinogens, which can cause gastric cancer, intestinal cancer, renal cancer and cancers of breast, ovary and small intestine.
People's Network-What are the hazards of waste oil? Five tips for identifying waste oil