What vitamins do teenagers supplement?

Teenagers often need to supplement three vitamins.

1, vitamin a

The chemical name of vitamin A is retinol, which is the earliest discovered vitamin. 19 13 years, Davis and other four scientists found that cod liver oil can cure dry eye. Yellow viscous liquid was purified from cod liver oil. 1920, British scientist Magnet officially named it vitamin a.

Internationally, vitamin A is officially regarded as an essential factor in nutrition, and its deficiency will lead to night blindness. Vitamin A can be divided into vitamin A alcohol and carotene. Vitamin A can treat eye diseases, and its use has been discovered as early as ancient times. Vitamin A is a rhodopsin component that feels weak light in visual cells, which is related to dark vision. If the human body lacks vitamin A, it will affect the dark adaptation ability.

2. β -carotene

β -carotene (C40H56) is one of carotenoids and an orange fat-soluble compound. It is the most common and stable natural pigment in nature.

β -carotene can be converted into vitamin A after entering the human body, and its molecular structure is equivalent to two molecules of vitamin A. After entering the human body, 50% of it is converted into vitamin A through the action of enzymes in the liver and small intestine mucosa, which has the function of nourishing the liver and improving eyesight and can treat night blindness.

In recent ten years, carotene has attracted unprecedented attention in the medical field. Experiments show that the vision of the eyes depends on the macula of the fundus. If there is not enough β -carotene for protection and support, degenerative diseases will appear in this part, that is, aging, decreased vision and even night blindness.

Therefore, adequate intake of β -carotene plays an important role in treating eyes.

3, vitamin C.

Vitamin C is the general name of compounds showing the biological activity of ascorbic acid, and it is a water-soluble vitamin, which is rich in fruits and vegetables. Vitamin c is also good for the eyes.

Vitamin C is a nutrient element of intraocular lens, and insufficient intake of vitamin C is one of the factors leading to cataract, so patients should take more vitamin C.

Extended data:

Foods rich in vitamins

First of all, we are talking about provitamin A, that is, various carotene, which exists in plant foods, such as green leafy vegetables, yellow vegetables, fruits and so on. Spinach, alfalfa, pea seedlings, red sweet potatoes, carrots, green peppers and pumpkins are rich in content.

The other is vitamin A from animal food, which can be directly used by human body and mainly exists in animal liver, milk and dairy products (non-skimmed milk) and eggs.

Secondly, we are talking about β-carotene, the most abundant source of which is green leafy vegetables and yellow and orange fruits (such as carrots, spinach, lettuce, potatoes, sweet potatoes, broccoli, cantaloupe and wax gourd). Generally speaking, the darker the color of fruits or vegetables, the richer the beta-carotene.

Finally, talk about foods containing more vitamin C. In fact, there are many foods containing vitamin C, among which the highest content is cherry, followed by guava, red pepper, persimmon, broccoli, strawberry, orange, kale flower, kiwi fruit and so on.

People's Network-Teenagers often play computer games and need vitamins. These foods can be eaten often.