The oil temperature is too high.
When cooking, some people like to stir-fry at high temperature. Every time they cook, they habitually wait for the oil in the pot to smoke before putting food. Experts remind that this is extremely unscientific. Excessive temperature will destroy some nutrients contained in edible oil and produce some peroxides and carcinogens.
Suggestion:
When cooking, it is best to heat the pan first and then put the oil in it, so as to achieve the effect of cooking with hot oil at the same time, killing two birds with one stone.
The use of oil is also important. It is best not to let the oil "smoke" when cooking. Improper cooking, even the best oil will become "bad".
The type of oil eaten is too single.
For convenience and health, many families usually only eat one kind of oil for a long time, thinking that this can be beneficial to health.
Barrel oil is the most affordable.
It's not appropriate to buy a big barrel of oil and cover it the day after tomorrow. The oxidative deterioration of oil is a chain reaction, which is highly contagious. If you put fresh oil in an old oil bottle, it will go bad quickly. Therefore, it is incorrect to repeatedly fill edible oil with large plastic bottles, which is easy to accelerate the oxidation of oil. The correct way is to use a small oil cup or oil bottle with a cover to take oil from a big oil barrel every few days, put it in the cupboard on weekdays and take it out when cooking. Small oil cups and small oil bottles should be replaced regularly. Try to buy fresh small packaging oil. If you buy a vat of oil, put it in the shade and tighten the lid.
Eat only vegetable oil, not animal oil.
In order to prevent the "three highs" problem and obesity, many people often use vegetable oil in cooking, and resolutely put an end to the mixing of animal oil.
Experts remind:
If you don't eat animal oil for a long time, it will cause the lack of vitamins and essential fatty acids in your body and affect your health. It doesn't mean that eating only vegetable oil but not animal oil can be beneficial to your health. In fact, animal oil (saturated fatty acid) is beneficial to human body in a certain dose.
Use too much oil.
Oil consumption should also be strictly controlled. For example, some people with normal blood lipids and weight should control the total amount of oil used every day to no more than 25 grams, and polyunsaturated fatty acids and monounsaturated fatty acids basically account for half. The elderly, dyslipidemia, obesity, people with obesity-related diseases or people with a family history of obesity, their daily oil intake is even lower, even as low as 20 grams.
Suggestion:
The knowledge about cooking oil is not limited to these. In addition, there are certain skills in choosing edible oil. For example, the same brand of cooking oil, it is best to choose a lighter one. There are more cooking oil skills that need to be carefully explored in daily life.
As long as it is oil, it can be used for frying.
Unsaturated fatty acids will change when vegetable oil is heated for a long time. For example, the vegetable oil used for fried fritters, fried chicken and scallion cakes will eventually become saturated fatty acids that are not good for blood vessels due to repeated heating. Therefore, it is not appropriate to fry food repeatedly with small package vegetable oil.
Don't eat meat oil, eat as much vegetable oil as possible.
Many people think that since they can't eat meat oil, it's okay to eat more vegetable oil. Therefore, some families consume as much as 50 grams or more of vegetable oil per person per day. In fact, this is a big misunderstanding. Improper consumption of vegetable oil can also lead to diseases such as hypertension and hyperlipidemia.
After laboratory tests, eating too much cooking oil will not only affect the taste of food, but also affect the absorption of food by human body. Eating this dish for many years is extremely unfavorable to cardiovascular and cerebrovascular diseases, and it is also easy to induce diseases such as cholecystitis and pancreatitis.
In the case of general energy intake, a normal person should consume about 25 grams of vegetable oil every day, except the fat contained in animal and plant foods. Obesity and hyperlipidemia patients should reduce the amount, but it should not be less than15g.
Afraid of obesity and don't eat oil
Advocating cooking with less oil does not encourage an oil-free diet. Proper amount of oil can not only provide fatty acids needed by human body, promote the absorption of fat-soluble vitamins, but also soften food fiber, reduce food volume, provide satiety and prevent gallstones. Even if you want to lose weight and diet, you need at least 20 grams of dietary fatty acids every day to maintain normal bile excretion. Insufficient fatty acids can damage skin health.
If olive oil is good, eat olive oil.
Experts advise families not to eat a single petroleum product for a long time. Oil should be changed to eat, and blended oil can be properly blended in time, which is beneficial to health. Blended oil is made of several different vegetable oils in a certain proportion through special processes. Its nutritional content is much higher than that of edible oil with single raw material, and its taste is suitable for China people's eating habits. In the investigation of consumer edible oil, it is found that most families eat the same oil for several years because of insufficient understanding of the health of edible oil.
How to eat oil is healthier?
Generally speaking, it is recommended to fry food with high smoke point oil, such as rapeseed oil. A British research report shows that cooking on a cooker with poor ventilation system and extremely low combustion efficiency for one hour is equivalent to smoking two packs of cigarettes a day. This is related to the mutation of edible oil at high temperature. For example, vegetable oil begins to oxidize when the oil temperature rises to 60℃, and oxides begin to decompose when the oil temperature rises to 130℃, forming various compounds, some of which are carcinogens. Rapeseed oil has the characteristics of high heat resistance and high smoke point, and there is no oil smoke at the high temperature of 2 15℃, which is especially suitable for cooking methods such as frying.
Edible oil is recommended to use oil containing various nutrients, such as corn oil. The content of unsaturated fatty acids in corn oil is as high as 80% ~ 85%, and it is rich in corn sterol. If you don't pay attention to balance and control in your daily diet, it will easily lead to "three highs", obesity and cardiovascular diseases. The sterol in corn oil can effectively prevent coronary atherosclerosis, promote the degradation and metabolism of cholesterol and fat, and has a positive preventive and therapeutic effect on cardiovascular disease, obesity and arteriosclerosis.
It is recommended to use natural vegetable oil, such as olive oil, for cold salad oil. Cold salad emphasizes freshness, and the original ecological ingredients are a perfect match with pure natural olive oil. Cold salad made of olive oil not only tastes fresh and mellow, but also has the effects of preventing aging and prolonging life because olive oil is rich in very rare active substances such as olive polyphenols and squalene.