Uncle Liu had been suffering from poor appetite since she had had surgery. She was not always clear about things late at night. She thought that she had spent her nights with blindfolded presbyopia or had a cataract. The doctor said that it was due to a lack of vitamin A, and told her to eat more carotene-rich foods, such as carrots, pumpkins, vegetables, eggs, liver, fish, dairy products, or oral cod liver oil. After returning home, Uncle Liu bought his Alaskan deep-sea fish oil for his wife to eat, resulting in no effect on his wife's night blindness. It turned out that Uncle Liu thought that fish oil was cod liver oil.
In fact, fish oil and cod liver oil are two different things. Their composition is different, the effect is different.
Cod liver oil is extracted from the liver of fish and is an oily liquid with a fishy smell, containing vitamin A and vitamin D. Vitamin A is very important to the human immune system. If it is lacking, night blindness and dry eyes can occur. However, in addition to vitamin A can be taken from cod liver oil, in general foods such as animal liver, egg yolk, milk and dairy products, carrots have. Vitamin D is an indispensable nutrient in human bones. Once it is lacking, it can cause cartilage disease. In general, inactive vitamin D is stored under the skin and can be converted into active vitamin D under the influence of sunlight and ultraviolet rays to meet the needs of the human body. However, this ability of the skin will weaken year by year as the age increases. Therefore, the elderly should also pay attention to vitamin D supplements.
Fish oil is an extract of deep-sea fish fat, belonging to oils and fats. It is also an oily liquid with a weak fishy smell. However, its composition is very different from that of cod liver oil and contains omega-3 fatty acids (polyunsaturated fatty acids). , including eicosapentaenoic acid (abbreviated as EPA) and docosahexaenoic acid (abbreviated as DHA), these substances can reduce human blood LDL cholesterol (also known as bad cholesterol), triglycerides, and increase High-density lipoprotein cholesterol (also known as good cholesterol) to prevent the formation of atherosclerotic plaque, and prevent platelet aggregation by affecting the metabolism of other substances in the body to prevent thrombosis. DHA can also play an important role in nerve conduction through the blood-brain barrier, and it is a good brain material.
This shows that fish oil and cod liver oil have different health effects on the human body. They must not be confused when taken and they must not be replaced with each other. Fish oil intake is relatively large. If you use the same amount of cod liver oil, it is bound to produce accumulation of poisoning. The excessive consumption of cod liver oil in children causes vitamin A poisoning. Vitamin D poisoning is not rare in clinical practice and cannot be taken lightly
The use of fish oil as cod liver oil, because deep-sea fish oil is a food, although there is no side effects after eating, it will delay proper treatment (such as Liu's husband later developed into corneal softening disease). Conversely, if fish oil is to be eaten as a fish oil, it can cause large accumulations of poisoning as described above.
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