Vitamin A is a fat-soluble vitamin essential for many functions of the body, including a good immune system and proper vision. However, pregnant women, breastfeeding mothers, and children are at risk of vitamin A deficiency. You can get vitamin A from meat, dairy products, eggs, and plant foods. Preformed vitamin A and provitamin A are the two kinds of vitamin A found in foods. Preformed vitamin A, also known as retinol, is the active form found in a variety of foods, including meat, fish, eggs, and dairy products .
On the other hand, provitamin A is found in fruits and vegetable, which is the inactive form, such as the carotenoids alpha-carotene, beta-carotene, and beta-cryptoxanthin. The inactive form ”provitamin A” is converted into an active form in your body. In your small intestine, for example, beta-carotene is converted to retinol, and retinol is an active form of vitamin A . This article reviews vitamin A deficiency signs and symptoms.
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Deficiency of vitamin A may cause night blindness . Several observational studies show that night blindness is the sign of VA deficiency , , , . In one research, women with night blindness took vitamin A as food or supplements. Both sources of vitamin A improved night blindness by 50% in 6 weeks of treatment . To preserve a healthy vision, it is essential to receive sufficient amounts of vitamin A from food. Night blindness is the first symptom of vitamin A deficiency.
Adequate vitamin A intake is critical for eye health. Dry eyes and night blindness are two of the earliest symptoms of vitamin A insufficiency.
Children not receiving enough vitamin A can experience stunted growth. This is because vitamin A is necessary to make the human body grow properly. Several studies have shown that vitamin A can boost growth, alone or with other nutrients , , , . However, most of these studies are performed on children . A study found that vitamin A supplementation in combination with other nutrients may have a greater impact on growth than supplementation with vitamin A alone . For example, children with stunted growth receiving multiple vitamins and minerals scores better than those receiving only vitamin A .
In children, a lack of vitamin A can lead to stunted growth. Vitamin A supplementation in combination with other nutrients may increase growth more than vitamin A supplementation alone.
Because vitamin A stimulates skin health and battles inflammation, it can also prevent acne. Different studies show that low levels of vitamin A can increase acne , . In one research of 200 adults, those with acne had 80 mcg vitamin, which was lower than those who did not have the disorder . People can use it either topically or orally to treat acne. Research shows that vitamin A cream can reduce the number of acne lesions by 50% . Isotretinoin is the most known source of oral vitamin A used for treating severe cystic acne. This medication may be very effective in treating acne but may have several side effects, including changes in mood and birth defects .
Acne has a clear link with vitamin A deficiency. Both oral and topical forms of vitamin A are beneficial in treating acne, although they can have unfavourable side effects.
Recurring infections can be a sign of vitamin A deficiency, especially in the throat or chest. Vitamin A supplement can help with infections in the respiratory tract, but research results are conflicting. Research in children found that underweight children taking 10,000 IU of vitamin A per week had fewer respiratory infections than those getting a placebo . In another study in children, they found that excessive vitamin A may increase the risk of developing infections in the throat and chest by 8% . The author of the study says, Vitamin A supplement is for those who are true deficit . According to one study in elderly people, high blood levels of provitamin A can protect against respiratory infections .
Vitamin A supplements may protect underweight children from illnesses, but they may raise infection risk in other groups. Adults with high vitamin A level in their blood may have fewer throat and chest infections.
Wounds healing or delayed healing after injury or surgery have a close connection with low levels of vitamin A in the blood. This is because vitamin A encourages collagen production, which is an important component of healthy ski . Recent rat research has found that treating skin with vitamin A has proven to prevent diabetes-related wounds . Research shows similar results in humans. Elderly men who treated wounds with vitamin A reduced the size of their wounds by 50% compared to men who did not use the vitamin A cream .
Vitamin A, both oral and topical, can enhance wound healing, particularly in people who are prone to wound.
Vitamin A is important for male and female reproduction, and for proper growth in babies . If you have trouble getting pregnant, one reason may be a lack of vitamin A. Studies show that female rats with vitamin A deficiency are having difficulty getting pregnant, and may have birth defect embryos . Some research suggests that infertile people may be more in need of antioxidants because of increased levels of oxidative stress throughout their bodies . Vitamin A is one nutrient in the body which acts as an antioxidant. The deficiency of vitamin A can also cause miscarriages. Research testing the blood levels of different nutrients in women with recurrent miscarriages showed they had low vitamin A level .
Fertility problems can affect both men and women who do not get enough vitamin A. Vitamin A deficiency might cause miscarriages or birth abnormalities.
Vitamin A is important for developing and repairing skin cells. It also helps to reduce inflammation because of some skin problems . Not having enough vitamin A could develop eczema and other skin problems . Eczema is a swollen, itchy and inflamed skin condition. Alitretinoin, a prescription medication with vitamin A, was effective in the treatment of eczema in several clinical studies , . In one 12-week study, people with chronic eczema who took 10–40 mg of alitretinoin per day observed a reduction of their symptoms by up to 53% . However, dry skin can be a symptom of many conditions, but vitamin A deficiency may be one of those reasons.
Vitamin A has a crucial function in skin regeneration and helps fight inflammation. A lack of this vitamin might cause inflammatory skin problems.
Eye problems are among the most well-known vitamin A deficiency. Sometimes, vitamin A deficiency can lead to complete blindness called Bitot’s spots , . One of the first symptoms of a vitamin A deficiency is dry eyes or the inability to produce tears. Young children in India and Southeast Asia who have a vitamin A deficiency are at the highest risk of dry eyes . Vitamin A supplementation may improve the condition. One study found that high doses of vitamin A decreased the symptoms of dry eyes by 63% in infants and children who were taking supplements for 16 months .
A lack of vitamin A can cause dry eyes, blindness, or withering corneas, sometimes known as Bitot’s spots. The inability to generate tears is frequently one of the first indicators of insufficiency.
Side Effects of Too Much Vitamin A
Too much Vitamin A can be dangerous. Excess vitamin A in the liver can cause toxicity and adverse symptoms, such as changes in vision, bone swelling, mouth ulcers, and confusion . In particular, pregnant women should be careful not to eat or take too much vitamin A to prevent birth defects , . Always consult with your health care provider before taking vitamin A or any other supplements. People with certain types of health can require a greater amount of vitamin A. Most healthy adults, however, require 700–900 mcg daily. Females who nurse need more, while children need less .
Toxic vitamin A is mainly caused by consuming too much of the vitamin in supplement form. It has the potential to cause major problems, such as eyesight abnormalities, oral ulcers, disorientation, and birth deformities.
Inflamed skin, night blindness, infertility, and respiratory infections can be the signs and symptoms of vitamin A deficiency. Eat a variety of these foods to ensure you are receiving enough vitamin A. Talk to your doctor or health care provider if you think you have a vitamin A deficiency.