Zhang Yi said to her mother while picking up the vegetable oil on the supermarket counter. "However, you are so old and have hyperlipidemia. Stop eating lard. I heard that eating too much raises cholesterol. And eat the vegetable oil I bought for you. This oil is healthy. "
But my mother has been eating lard for decades and has long been used to it. "Don't buy it for me. I still think lard is delicious. Don't spend this money. "
"This is how to spend money? You didn't watch the news that lard is high in fat and not suitable for the elderly. " Zhang Yi is obviously a little angry.
Aunt Zhang wanted to say more, but when she saw her mother's face heavy, she only murmured, "We ate all this." Finally, she bought vegetable oil for her mother.
This kind of argument is not uncommon between two generations. Is lard delicious or harmful to health? Look at the bottom of the article
The Confucian classic "Zhou Li Tianguan Zhong Zai" records that "the calf roams in autumn and the paste stinks", which refers to lard. This sentence is translated into vernacular: "It's time to eat lard in autumn".
It can be seen that China people had the habit of eating lard thousands of years ago. Whether cooking or mixing with staple food, lard will sublimate food into "turning stone into gold".
Many people are curious: it is reasonable to say that oil itself is weak in volatility and basically can't smell, but why is lard so fragrant?
The smell of lard is actually a kind of "deception" of the brain.
Humans are extremely sensitive to the smell of mutton, and we instinctively realize that smelling mutton means having fat sheep to eat. When meat is heated, there will be a chemical reaction, which will volatilize the aroma, so raw mutton smells more fragrant, and it will not smell so bad when cooked. This reaction is called Maillard reaction.
This reaction will also occur during the boiling of lard. Once the fat pork without flavor is heated, it will produce many small molecules of volatile organic compounds, which are keenly captured by our sense of smell. These substances are defined as "fragrance" by our brains.
From the nutritional point of view of human physiology, oil can provide heat, provide essential fatty acids and promote the absorption of fat-soluble vitamins, which is an important part of maintaining human physiological functions. However, excessive oil intake does threaten cardiovascular health.
Excessive fat intake is one of the important factors inducing cardiovascular diseases. As animal fat, lard contains saturated fatty acids (above 40%) and cholesterol (including 1000ppm), which is an unfavorable factor for cardiovascular diseases.
Epidemiological studies show that excessive intake of saturated fatty acids will increase the content of low-density lipoprotein cholesterol in blood and increase the incidence of arteriosclerosis. In 2004, FDA proposed that replacing lard with vegetable oil in daily diet is indeed more beneficial to cardiovascular health.
But why do modern people eat less lard and have more and more cardiovascular diseases? This is because the increase in the incidence of cardiovascular diseases is not just a single factor of "not eating lard". Risk factors affecting cardiovascular diseases include smoking, second-hand smoke, obesity, unhealthy diet, lack of exercise, life expectancy and so on, which are the results of comprehensive effects.
Therefore, it cannot be considered that the decrease in lard consumption is necessarily related to the high incidence of cardiovascular diseases.
In the eyes of most people, vegetable oil is better than animal oil, and many healthy people like to use olive oil and corn oil. However, an article published in the British "Daily Telegraph" said: Studies have found that ordinary vegetable oil will produce a large number of aldehyde compounds, which are carcinogenic to human body and may be more dangerous than animal oil.
This made everyone panic.
In this regard, Gu Zhongyi, a nutritionist at Beijing Friendship Hospital, said: Don't panic! The truth is not that terrible. The temperature of this experiment is higher than the smoke point of the oil itself, and it takes a long time to cook. Some conclusions in the article are also exaggerated and misleading, and cannot be used as conclusive scientific evidence.
So which is better, vegetable oil or animal oil?
Oils and fats include saturated fatty acids, monounsaturated fatty acids and polyunsaturated fatty acids.
Generally speaking, animal fat contains more saturated fatty acids. Excessive intake may lead to an increase in blood cholesterol, triglycerides and low-density lipoprotein cholesterol, which is not good for health. Vegetable oil may be more beneficial to health, and its unsaturated fatty acids can reduce blood lipid, improve blood circulation, inhibit platelet aggregation, and be better for cardiovascular system.
Of course, we don't have to completely avoid eating animal oil. After all, it tastes good and has a special flavor, and eating it occasionally does no harm to your health.
1, no redundancy
According to the recommendation of China residents' balanced diet pagoda, healthy adults cook 25.30 grams of oil every day; The intake of saturated fat should not exceed 10% of the total daily calories. If converted into lard, it is about 50g.
Step 2 diversify
Different oils and fats have different fatty acid compositions and different nutritional characteristics. So peanut oil, soybean oil, rapeseed oil and olive oil can all be mixed. For example, use sesame oil and olive oil when it is cold; When cooking, use peanut oil; Toast, butter, etc.
3. Control the intake of trans fatty acids.
Trans fatty acids are not good for health. According to the recommendations of international experts and public health authorities, trans fatty acids should be controlled below 65,438+0% of the total intake, and foods containing more trans fatty acids such as cream and biscuits should be avoided as much as possible in daily life.
Whether it is lard or vegetable oil, as long as it is not excessive intake, it will not pose a risk to health. While enjoying delicious food, learn to use oil scientifically and form good habits, so as to enjoy the delicious food brought by oil with peace of mind.
# Zero Zero Plan #
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