Dietician
Karolina Dobrowolska-Zrałka
Vitamin A is one of the key micronutrients, without which our body could not function fully. It is responsible for the proper growth of cells, supports the health of the skin, mucous membranes and eyes, and also affects the proper functioning of the immune system. Although we think about this vitamin most often in the context of carrots and orange vegetables, in fact its sources are much wider and varied. In this article, we will discuss in detail what vitamin A is, what functions in which plant and animal products are in the largest quantities, how to absorb it best and whether and when it is worth considering supplementation. You will also learn how to arrange a diet rich in this vitamin in practice to enjoy health and energy every day.
What is vitamin A?
Vitamin A is a group of chemical compounds, which include retinol, retinal and carotenoids (the most famous beta-carotene). Retinol occurs mainly in animal products, while beta-carotene, the precursor of vitamin A, can be found primarily in plants. In the body, beta-carotene transforms into retinol according to the demand, which means that even a vegan diet with a well-chosen menu can provide the right amount of this vitamin. In the daily diet, we recognize vitamin A primarily as a factor responsible for proper vision after dark, maintaining healthy skin and mucous membranes, and supporting the immune response. Thanks to the ability to regulate gene expression, it also participates in cell growth and differentiation processes, which makes it a key element during the period of intensive development, e.g. in children and adolescents.
In addition to natural forms in food, vitamin A is used in medicine and cosmetics - retinoids are used to treat acne, psoriasis or as an ingredient in anti -aging creams. It is worth remembering, however, that excessive supply of retinol can lead to toxicity, so you should always take care of balance and use professional medical or dietary recommendations.
The role of vitamin A in the body
Vitamin A performs many important functions in the human body. First of all, it participates in the synthesis of rhodopsy - visual dye that allows vision in conditions of low light. Thanks to this, it protects against so -called "Dust with blindness" and supports the proper functioning of the retina. Another aspect is the effect on skin and mucous membranes: retinol stimulates cell renewal, promotes collagen production and improves the elasticity of the epidermis. As a result, the skin remains firm and the wounds heal faster.
Vitamin A is also crucial for the immune system - it supports the production and activity of T lymphocytes and macrophages, which contributes to the more effective fight against pathogens. It also participates in the processes of blood cell differentiation, supporting the production of red and white blood cells. People with a deficiency of this vitamin are observed by reduced immunity, more frequent respiratory tract infections or growth disorders in children.
No less important is the effect of vitamin A on fertility - in women it supports the proper functioning of the ovaries and implantation processes, in men it affects the quality of sperm. In addition, it participates in the regulation of vitamin D metabolism and affects calcium-phosphate management, which translates into bone health.
Natural sources - vegetables and fruits
The most recognizable precursor of vitamin A in a plant diet is beta-carotene. We will meet him primarily in carrots, pumpkins, sweet potatoes, red peppers and green deciduous vegetables, such as spinach, Boćwina and kale. Beta-carotene gives these products an intense color, which is why the more saturated the color, the usually the higher content of provitamin A. It is worth introducing to the menu, among others Carrots baked with a little olive oil, pumpkin cream or salad with kale and avocado.
Fruits can also be a valuable source of carotenoids. Mango, apricots, papaya or grapefruits provide beta-carotene and other antioxidants. In the summer season, fruit cocktails with apricots or mango will not only refresh, but also enrich the diet in provitamin A. It is worth combining them with fat-natural yogurt or vegetable milk-which will improve the absorption of beta-carotene (dissolves in fats).
To get a full spectrum of carotenoids, it is worth interlacing vegetables of different colors in the menu - carrots with green spinach, red peppers with tomatoes or lentils with sweet potatoes. Thanks to this, we will not only provide beta-carotene, but also lutein, zeaxanthin or lycopene, which have additional antioxidant properties.
Animal products rich in vitamin A
Retinol, the active form of vitamin A, occurs primarily in animal products. The liver (poultry, beef or veal) is an absolute leader - it contains several times more retinol than fatty fish or eggs. Already 100 g of chicken liver covers the multiple of the daily demand for this vitamin, so it is worth consuming it in moderation.
Fatty fish, such as salmon, mackerel or herring, also provide a lot of retinol, and at the same time healthy omega-3 acids, which support the absorption of fat-soluble vitamins-A, D and E. Chicken eggs (especially yolks) are another valuable source of retinol, as well as high-quality lecithin and protein.
Duck or geese meat, although less popular, can enrich your diet with vitamin A and minerals such as iron and zinc. For people looking for a convenient solution, the perfect complement to the diet is the Supersonic Food product - Smart Meal, a full -fledged powder meal that provides necessary vitamins, including retinol, in an easy -to -prepare form.
How to best absorb vitamin A
Vitamins A and its provitamins are fat-soluble, which is why it is worth adding healthy fat to every meal rich in beta-carotene or retinol. Olive oil, avocado, nuts or rapeseed oil will improve the bioavailability of this vitamin by as much as 40-60%. For example, carrot salad with a little oil or a salad with spinach and avocado are the perfect sets that increase absorption.
A regular and diverse diet is the basis - consuming products rich in vitamin A in various forms (plant and animal) ensures a constant supply of retinol and its precursors. However, avoid displaying these products to a high temperature for a long time, because some provitamin may be degraded. Steamed cooking or light thermal treatment (blanching) helps maintain optimal levels of carotenoids.
It is also worth remembering about synergy with other micronutrients-vitamin E acts as a natural antioxidant, protecting beta-carotene against oxidation. The addition of pumpkin seeds, nuts or sunflower seeds for dishes rich in carotenoids is a simple way to increase their stability and effectiveness of action.
Vitamin A supplementation - is it worth it?
Although it is best to draw vitamin A from full -fledged products, in some situations supplementation may be justified. People with fat absorption disorders (e.g. with celiac disease, liver or pancreas diseases) may have a problem with proper assimilation of retinol and beta-carotene from the diet. Pregnant and breastfeeding women should monitor its level to avoid both deficiency and excess, which can be teratogenic.
Preparations containing retinol should be used carefully and as recommended by a doctor or dietitian. Beta-carotene supplements are definitely safer, because the body transforms it into retinol according to current demand, which minimizes the risk of toxicity. A good solution is also to reach for comprehensive mixtures of fat -soluble vitamins (A, D, E, K), which cooperate well and support their action.
If you feel that your diet may be poor in products rich in vitamin A, think about turning on a beta-carotene supplement or a ready vitamin mix. Remember, however, that supplementation will never replace a healthy, balanced menu.
Sources
- European Food Safety Authority - Dietary Reference Values for Vitamin A.
- National Institutes of Health (Nih) - Vitamin a fact sheet for health professionals.
- World Health Organization (WHO) - vitamin a deficiency: prevention and control.
- Polish Society of Dietetics - recommended consumption of vitamin A.
- Szponar, L. et al., "The role of beta-carotene in the human diet", Journal of Food Science, 2021.
FAQ
What deciduous vegetables are the richest in vitamin A?
Renitamine with the highest content of provitamin, boćwin, kale and arugula belong to deciduous vegetables. In 100 g of fresh spinach we will find as much as 469 μg of retinol equivalent (re), which covers a significant part of the daily demand. These vegetables are best served slightly blanched or in the form of smoothie with the addition of oil to improve the absorption of beta-carotene.
How much vitamins is in carrots?
Carrots are one of the richest sources of beta-carotene: in 100 g raw carrots there is about 835 μg re. This value may vary slightly depending on the variety and the conditions of cultivation. Carrot consumption in raw, baked or cooked with the addition of fat increases the bioavailability of beta-carotene by up to several dozen percent.
Can a vegan diet cover the demand for vitamin A?
Yes, with a well -balanced vegan menu we will provide the right amount of provitamin and from vegetables and fruits such as carrots, sweet potatoes or green leafy vegetables. It is key to combining them with fat (olive oil, avocado) and differentiate the sources of carotenoids. Beta-carotene supplementation can additionally protect against any deficiency.
How often should products rich in vitamin A?
To maintain a constant level of vitamin A, it is worth including its sources in the diet at least 3-4 times a week. The rotation of plant products (carrots, spinach, pumpkin) and animal (liver, fish, eggs) avoids monothematic nutrition and increases retinol bioavailability.
What are the symptoms of vitamin A deficiency in children?
Vitamin A deficiency in children may manifest with vision problems after dark (so -called dust blindness), dry conjunctiva, frequent respiratory tract infections, growth disorders and weakening of immunity. In extreme cases, it leads to changes on the skin and mucous membranes, which is why it is important to monitor the diet and consult a pediatrician.
Is excess vitamin A harmful in the diet?
Yes, chronic over -tacing retinol can lead to toxicity manifested in headaches, nausea, dry skin, bone brittleness and liver damage. For this reason, retinol supplements should be used carefully, and beta-carotene preparations are a safer alternative.
At what times of the year is it worth paying special attention to the consumption of vitamin A?
In winter and early spring, when the availability of fresh vegetables and fruits decreases, it is easier for provitamin A deficiencies. It is worth increasing the intake of frozen food, preserved vegetables and fatty fish, as well as consider beta-carotene supplementation or ready vitamin-mineral formulas.
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