Is vitamin A water soluble?

Vitamin A is one of the essential vitamins for the body. Vitamin A plays an important role in maintaining your vision. Lack of vitamin A, vision will be impaired, even blind. The main active form of vitamin A is called retinol. The best sources of vitamin A include liver and fish oil. Sufficient amounts can also be obtained from vitamin A-providing carotenoids, such as beta-carotene, found in vegetables.

1. Is Vitamin A soluble in water?


Vitamins can be classified based on their solubility properties. Most vitamins are water-soluble, such as vitamin B, vitamin C. In contrast, there are vitamins that are fat or fat soluble and they are insoluble in water.
Fat-soluble vitamins are most abundant in high-fat foods and are absorbed into the bloodstream much better when you eat them with fat. There are four types of fat-soluble vitamins in the human diet: vitamin A, vitamin D, vitamin E, and vitamin K. This article provides a comprehensive overview of vitamin A, a fat-soluble vitamin , its health benefits, and its main food source.
Vitamin A
Vitamin A được hấp thụ vào máu tốt hơn khi bạn ăn cùng với chất béo

2. Classification of vitamin A


Vitamin A is not actually a single compound. Rather, it is a group of fat-soluble compounds known collectively as retinoids.
The most common form of vitamin A found in the diet is retinol. Other forms of vitamin A are found inside the body but are absent or very rarely found naturally in foods such as retinal and retinoic acid.
Vitamin A2 (3,4-dehydroretinal) is an alternative, less active form found in freshwater fish.

3. Role and function of Vitamin A

Vitamin A supports many important aspects of body function, including:
Maintaining vision: Vitamin A is needed to maintain light-sensing cells in the eye and to form tears. Immune function: Vitamin A deficiency impairs immune function, increasing the likelihood of infection. Body growth: Vitamin A is necessary for cell growth. A vitamin A deficiency can slow or prevent growth in children. Hair Growth: Vitamin A is also important for hair growth. A vitamin A deficiency can lead to hair loss.
Rụng tóc
Vitamin A cũng rất quan trọng cho sự phát triển của tóc

Reproductive function: Vitamin A maintains fertility and is important for fetal development. In the human body, vitamin A is best known for its important role in maintaining vision. It is also needed for body growth, immune function, and reproductive health.

4. What to eat to supplement vitamin A?


Vitamin A is only found in foods of animal origin. Natural food sources of vitamin A include animal liver, fish oil, and avocados.
Vitamin A can also be obtained from certain carotenoid antioxidants found in plant-based foods. These are collectively known as provitamin A. The most effective of these is beta-carotene, which is found in many vegetables, such as carrots, kale, and spinach.
In addition to eating well, vitamin A can also be added to the body in the form of oral tablets. While supplementation is beneficial for people with vitamin A deficiency, most people get enough vitamin A from their diets and
do not need to take a supplement. However, controlled studies show that vitamin A supplements may be beneficial for some people even if their diets meet baseline requirements.
For example, vitamin A supplements can help treat measles in children. They protect against complications from measles pneumonia and reduce the risk of death by 50–80%. Studies show that vitamin A has the ability to block the action of the measles virus.
RDA is a measure of the estimated vitamin A requirement that the vast majority (about 97.5%) of people need on a daily basis.
The RDA for vitamin A is 3,000 IU (900 mcg) for adult men and 2,333 (700mcg) for adult women. For children, it ranges from 1,000 IU (300 mcg) to 2,000 IU (600 mcg).
Bệnh sởi
Bổ sung vitamin A có thể giúp điều trị bệnh sởi ở trẻ em

5. Vitamin A deficiency


Vitamin A deficiency is very rare in developed countries. However, vegans may be at higher risk because vitamin A is found naturally only in foods of animal origin. Although provitamin A is abundant in many fruits and vegetables, it is not always efficiently converted to retinol, the active form of vitamin A. The effectiveness of this conversion depends on genetics each person's transmission.
Vitamin A deficiency is also common in some developing countries where food is limited and varied. It is common in populations whose diets consist mainly of refined rice, white potatoes or cassava and lacks meat, fat, and vegetables in the diet.
A common problem that occurs early in vitamin A deficiency is night blindness. As it progresses, it can lead to more serious conditions, such as:
Dry eyes: A severe deficiency can cause blepharitis, a condition characterized by dry eyes due to decreased formation of the eye. into tears. Blindness: Severe vitamin A deficiency can lead to total blindness. In fact, it is one of the most common causes of blindness in the world Hair loss: Without vitamin A, the body can begin to show signs of hair loss. Skin problems: A deficiency leads to a skin abnormality known as hyperkeratosis or goosebumps. Poor immune function: A poor condition or deficiency in vitamin A makes people more susceptible to infections due to a weakened immune system. In a nutshell, vitamin A, also known as retinol, is a fat-soluble vitamin that has been linked to vision and eye health. The richest sources of vitamin A are liver, fish oil and avocados. It can also be derived from the provitamin A carotenoid found in red, yellow, and orange vegetables, as well as some dark green leafy vegetables. Vitamin A deficiency is rare in the developed world, but is most common in people who follow a diet lacking in variety, especially those that are predominately rice, white potatoes, and cassava. Early symptoms of vitamin A deficiency include night blindness, and severe deficiency can eventually lead to total blindness. While getting enough vitamin A is important, too much vitamin A in the body can be harmful. Pregnant women need to be very careful not to eat too much vitamin A because of the risk of birth defects.

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Bài viết này được viết cho người đọc tại Sài Gòn, Hà Nội, Hồ Chí Minh, Phú Quốc, Nha Trang, Hạ Long, Hải Phòng, Đà Nẵng.

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