The advantages and disadvantages of eating liver
Everyone often hears the saying "Pig liver eyesight". Many people also like to eat pig liver and other animal livers. The chef also specially developed the "Mingmu Pig Liver Soup" dish. Can pig liver eyesight make sense? There are people who say that eating liver can prevent myopia. Is this true?
Vitamin A is too much less
The liver is an important organ for storing vitamin A in animals. About 100 micrograms of vitamin A is contained in 100 grams of pig's liver. One of the important physiological functions of vitamin A is to maintain the normal structure of the cornea and ensure the normal function of the retina, which plays an important role in maintaining normal vision. In the absence of vitamin A, problems such as dry eyes and night blindness can occur. Therefore, for people who lack vitamin A, eating liver can indeed quickly supplement vitamin A, which has a certain effect on maintaining vision health. From this point of view, the statement of pig liver is justified, but if you want to rely on the liver to treat myopia, it would not be reliable.
However, vitamin A does not eat as much as possible. Vitamin A is fat-soluble and is not easily excreted from the body. Excessive intake may cause toxicity, resulting in abnormal bone growth and greater impact on pregnant women. Therefore, the upper limit for adult intake of vitamin A is no more than 3,000 micrograms per day. Dietary nutrition guidelines recommended by our residents suggest that the daily recommended intake of vitamin A (RNI) for adult males is 800 micrograms, and that of adult females is 700 micrograms, which translates into the weight of pig liver, which is generally 14 to 16 grams.
It is safer to add carotene
Pig liver is not the only dietary route to vitamin A supplementation. Many green, yellow, and orange-colored vegetables and fruits are rich in carotenoids. Some of these carotenoids have vitamin A activity in the human body and can be converted to vitamin A. Vitamin A has the highest activity, and the most abundant food is β-carotene. For most of our residents, beta-carotene is the main dietary source of vitamin A.
The source of botanical vitamin A, carotene, is not toxic to vitamin A. Even if too much carotene is taken from vegetables and fruits, the result is only carotene hypertrophy, which is yellowing of the skin but no harm to health. After stopping eating, the yellow color will fade.
Heavy metal veterinary drug accumulation in pig liver
Animal livers are important detoxification and metabolic organs in animals. Pig liver can be described as the largest "detoxifier" and poison "transfer station" in pigs. The toxic and harmful substances that enter the body, such as heavy metals, veterinary drugs, and pesticides, are excreted in the liver through metabolism, transformation, and detoxification. When liver function declines or the intake of toxic and harmful substances is high, the liver will accumulate these harmful substances.
In 2003, Guangxi Medical University investigated the liver foods sold in 10 farmers' markets in Nanning and found that the contents of heavy metal cadmium and lead in pig livers were high, which were 0.149 mg/kg and 0.703 mg/kg, respectively. Beyond China's food hygiene standards. In 2004, a Sichuan survey also found that the content of heavy metals in pig liver was higher than pork, but most of them did not exceed the standard. In 2012, a survey of pig livers sold in the Xiasha area in Hangzhou found that of the 23 samples submitted, more than 90% of the samples were suspected of excessive lead in heavy metals. Although the latter is only a small survey, the products submitted cannot fully reflect the safety of pig liver in Hangzhou. However, from a side, it reminds us that pig livers are prone to heavy metals and should not be eaten.
In addition to heavy metals, pig livers also tend to have high veterinary drug residues. A survey conducted in Chengdu found that veterinary drug residues in pig livers were higher in commercial animal products. Although most of them did not exceed the standards, they were still relatively high compared with pork and beef. In general, the viscera of pig liver, pig heart and other animal toxins are often more.
In addition, the pig's liver is also high in cholesterol, 100 grams of liver cholesterol is 288 mg. Insufficient cholesterol intake, especially low-density cholesterol intake, increases the risk of cardiovascular disease. For health reasons, do not consume more than 300 milligrams of cholesterol per day from food.
Although the vitamin A rich in liver is indeed beneficial for maintaining vision, pig liver is not the only way to obtain vitamin A, nor is it the best source of food for vitamin A. Therefore, eating a large amount of liver for the so-called eyesight effect is not a good choice.
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