What harm does eating old oil do to the body?

I often go to eat hot pot, and I only pay attention to the taste of the hot pot. It is delicious, and you still need to understand the cooking oil.

What is cooking oil? Some friends will immediately think of gutter oil. No, this kind of old oil refers to oil that has been heated repeatedly. The oil used in fried dough sticks and French fries will turn into soy sauce color if not replaced in time.

The most recent report is that a hot pot restaurant in Chengdu was fined 13.76 million for using old oil. With such a large fine, you can imagine how harmful old oil can be.

First of all, old oil should not be used because when cooking oil is repeatedly heated, a series of chemical reactions occur, producing many compounds that are harmful to human health. We all know that the main component of edible oil is triglycerides. When fried again, the temperature of the edible oil reaches 180-200 degrees Celsius. At high temperatures, the edible oil will "deteriorate".

Chemistry class begins. One is the oxidation reaction that occurs - producing many volatile substances, including saturated and unsaturated aldehydes and ketones, polycyclic aromatic hydrocarbons, etc. Many of them are volatile toxic substances. Acrolein, in particular, is the most dangerous inducer of lung cancer in oil smoke.

The second is the oxidation reaction - fried food releases moisture at high temperatures, which causes the edible oil to hydrolyze, produce fatty acids, and cause rancidity.

The third is the isomerization reaction - at high temperatures, cis fatty acids in edible oils are isomerized into trans fatty acids. Trans fatty acids can cause obesity, heart disease, diabetes, Alzheimer's and other chronic diseases.

For more than half a year, this Chengdu hot pot restaurant has saved operating costs in this way and used "old oil" to produce and sell toxic and harmful food, with sales reaching 1376,000 yuan. It can be said that it is a good way to make a fortune. The boss said that he was wronged, vomiting bitterness and saying in tears: "This is not what my family does. It's just like the fried dough sticks on the roadside. There is so much oil left after frying the dough sticks that day. Who would be willing to throw it all away? Isn't it a waste of natural resources?

Listen, this is a waste of natural resources, so can our health be ignored? Then we have Alzheimer's disease, can you be responsible?

"Old oil" is delicious, but it has many safety hazards:

1. Reuse of unsterilized old oil will carry a large number of infectious microorganisms, causing headaches, nausea, dizziness, vomiting, and gastrointestinal diseases in consumers.

2. The acid value of reused old oil is likely to seriously exceed the standard.

So what should we do if we eat old oil in a restaurant? Here are a few methods. Although there are not many ways to do it, I will introduce it to everyone.

As soon as you take it, pack up the "leftover oil" you have eaten and take it away. This can fundamentally prevent the reuse of leftover oil;

Secondly, stir it with a spoon before serving to check whether there is any residue in the bottom of the pot, such as cooked vegetables and meat;

Third, taste it. Except for some special hot pots that have a special taste, generally fresh pot bottoms have no peculiar smell. If you feel sour or have a strange smell after tasting, most of these pot bottoms are suspected of reusing "leftover oil", but it is generally difficult for customers to detect it.

In fact, the best way is not to eat, but it is not very practical. Then eat less frequently, so that your body can adapt to the situation and eliminate toxins as soon as possible.

Besides, it is also troublesome to develop pimples after eating too much hot pot. Every time I eat, I have pimples all over my face. It takes ten days and a half to heal.