If the human body lacks vitamin A, what effect does it have on health?
1, the earliest symptom of vitamin A deficiency is the decrease of dark adaptation ability, which can cause night blindness in severe cases. Vitamin A deficiency will lead to dry eye, and further development will lead to blindness.
2. Vitamin A deficiency not only causes eye symptoms, but also causes dryness, hyperplasia and keratinization of different tissues of the body, resulting in various symptoms, such as keratinization of sebaceous glands and sweat glands, dry skin, excessive keratinization of hair follicles, hair follicle papules and hair loss.
3. Vitamin A deficiency will cause low immune function, and it will also cause children's growth and development retardation.
4. vitamin a deficiency can also lead to loss of appetite and easy infection, especially for children and the elderly, which can easily lead to respiratory inflammation and even death in severe cases.
How to make up for vitamin A deficiency?
Supplementary method 1. Nutrition and health care products, appropriately increase the consumption of nutrition and health care products containing vitamin A, with high vitamin A content and quick absorption, such as cod liver oil.
Supplement 2: Eat more fruits and vegetables containing vitamin A, such as apples, loquats, cherries, shepherd's purse, tomatoes, eggplant and so on. Third, eat more meat containing vitamin A, such as pork, chicken, crabs, snails and other foods. -Vitamin deficiency is short-term, as long as it is supplemented by diet.
What are the foods containing vitamin A?
1. Fruits: pear, apple, loquat, cherry, banana, longan, apricot, litchi, watermelon and melon. Except apricots, the content of vitamin A in most yellow fruits is below 400 units.
2. Vegetables: ponytail, Chinese cabbage, shepherd's purse, tomato, eggplant, pumpkin, cucumber, green pepper, spinach, alfalfa, pea sprouts, red sweet potato, carrot, etc.
Harm of vitamin A abuse
For those in need, the advantages of using vitamin A outweigh the disadvantages. However, if you take a large dose of vitamin A for more than 6 months, it will have side effects. The eye is rich in blood vessels, and the blood flow is about 20 times that of brain tissue. Because melanin in retina and uvea has high binding force with some drugs, it is easily affected by long-term and large-scale drug use. Abuse of vitamin A will cause edema of ocular blood vessels, compression of optic nerve, blurred vision, diplopia, photophobia and nystagmus, even retinal hemorrhage and exophthalmos in severe cases, and even eyebrows and eyelashes will fall off.