Vitamin A, also known as retinol (its aldehyde derivative retinal) or anti-dry eye disease factor, is an unsaturated monohydric alcohol with an alicyclic ring, including both animal food-derived vitamins A1 and A2. A class of substances that have the biological activity of retinol.
What are the foods that contain vitamin A?
1. Fruits: pears, apples, clams, cherries, bananas, longans, apricots, litchi, watermelons, melons. With the exception of apricots, the vitamin A content of most yellow fruits is less than 400 units.
2, vegetables: mozzarella, Chinese cabbage, leeks, tomatoes, eggplant, pumpkin, cucumber, green peppers, spinach, wolfberry, pea sprouts, red sweet potatoes, carrots and so on. According to the food analysis table, the average (100 g) containing the most abundant vitamin A (about 12,000 units) is green leafy vegetables such as kale, kale, spinach, and other green vegetables. Even a knife bean, broccoli, carrot, yellow squash, apricot, sweet potato, or yam can provide 5,000 units of vitamin A, which is what adults need for a day. A tomato, pea, celery, lettuce and asparagus contained an average of nearly 2,000 units. This vitamin is missing in vegetables that have lost their original color or have never turned green.
3, plants: mung beans, rice, walnuts.
4. Animals: pork, chicken, eggs, cockroaches, crabs, snails. This category is vitamin A that can be used directly by the human body and is mainly found in animal livers, milk and dairy products (non-skimmed milk) and poultry eggs. The animal liver contains extremely rich vitamin A, and the amount contained in the animal kidney and chop is also high. Vitamin A is found in eggs and milk fat, and the amount depends on the food the animal eats. The amount of vitamin A per liter of whole milk is between 500 and 7,000 units, but the average is 2,000 units. After the milk is homogenized, most of the vitamin A is destroyed by oxygen, but so far, humans have not found a solution to this problem. The milk produced by cows fed with hay is winter butter, which may contain only 2000 units of vitamin A per 450 grams of butter, and an average of 12,000 units per 450 grams of summer butter. The amount of vitamin A added per 450 g of butter substitute is usually 12,000 units.
5. Cod liver oil: Cod liver oil is the most abundant source of commercial vitamin A. The vitamin A contained in the animal's liver depends on the animal's food intake and the age of the animal. In addition to the liver of the polar bear, the most recognized vitamin A supplement was liver oil from a 100-year-old giant locust at the London Zoo. The vitamin A content of Halibut cod liver oil was higher than that of cod liver oil because of the listing of halibut. When it is sold, it is older than the squid. The squid sold on the market is generally still in a relatively small stage. The halibut therefore has more years of feeding green seaweed. For the same reason, the vitamin A contained in the liver of adult cattle and sheep is much richer than the vitamin A contained in the liver of calves and lambs.
Vitamin A is suitable for people
1, long-term fat malabsorption, vegetarians, long-term contact lenses and long-term computer screen.
2. Those with poor body resistance and high cholesterol levels should be properly supplemented with beta-carotene.
3, regular supplements of vitamin C, E, while adding β-carotene can synergize.
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