15 Foods Rich in Vitamin A

This article will provide information on the key aspects of the topic. We will cover in detail the main points that will help you better understand the subject and its significance. Learn about current trends, best practices, and helpful tips that can be useful for both beginners and experienced professionals in this field. Read on to enrich your knowledge and improve your skills.

What is vitamin A;
What are the risks of its deficiency;
How much vitamin A do you need per day;
What foods contain it.

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What is Vitamin A

Vitamin A is not a single chemical compound, but an entire category of biologically active substances. This group includes retinol, retinoic acid, and provitamins such as beta-carotene, which play a key role in maintaining the body's health. Vitamin A is essential for normal vision, the immune system, and healthy skin. It also promotes cell growth and tissue development. A vitamin A deficiency can lead to various diseases, including vision impairment and weakened immunity. Therefore, it is important to ensure adequate levels of this vitamin in the diet, including foods such as carrots, spinach, and liver.

Retinoids are all active forms of the vitamin, such as retinol, retinal, and retinoic acid.
Carotenoids are beta-carotene, alpha-carotene, and beta-cryptoxanthin. These are provitamins that are converted into active retinol in the body as needed [2].

Beta-carotene is one of the most important provitamins, giving plants their yellow-orange pigment. During metabolism, beta-carotene breaks down into two retinol molecules, while other carotenoids are converted into only one molecule. Beta-carotene plays a key role in maintaining healthy vision and the immune system, and also helps normalize metabolism. It's important to get enough of this nutrient through your diet, including foods like carrots, sweet potatoes, and spinach.

Carotenoids include substances such as lycopene, lutein, and zeaxanthin. While they have beneficial properties for the body, it is important to note that they are not metabolic precursors of vitamin A, meaning vitamin A is not synthesized from these carotenoids. This highlights the importance of other sources of vitamin A, such as retinol, which is directly involved in maintaining healthy skin, vision, and the immune system. A proper diet that includes both carotenoids and sources of vitamin A promotes overall well-being.

How Vitamin A Was Obtained

In 1913, scientist Elmer McCollum and his colleagues conducted a study to determine the effects of different types of fats on the health of rodents. The results of the observations showed that the animals that received milk fat did not experience health problems, while those that ate lard became ill and stopped growing. These experiments became an important step in the study of the role of fats in nutrition and their impact on health.

Elmer W. McCollum Photo: KU Libraries

Not all animals feed on milk as children, but this does not prevent them from growing and developing. Scientists have discovered that there is a certain element found in milk that can also be found in other foods. This discovery highlights the importance of a varied diet for the growth and health of animals. Research is ongoing to better understand which components are necessary for proper development.

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B vitamins play a key role in maintaining health and ensuring the normal functioning of the body. They are involved in metabolism, support the nervous system, and promote energy production. Including foods rich in B vitamins in your diet will help improve your health. Here are ten foods that contain these important vitamins.

First on the list are grains, such as oatmeal and brown rice. They are an excellent source of vitamins B1, B3, and B6. Also worth noting are legumes, including beans and lentils, which are rich in vitamin B9, known as folate, which is important for cell division and DNA formation.

Eggs are another valuable food, containing vitamins B2, B5, and B12, which are necessary for maintaining a healthy nervous system. Dairy products, such as milk and yogurt, also contain B vitamins, especially B2 and B12, and help strengthen bones due to their high calcium content.

Nuts and seeds, such as almonds and sunflower seeds, are sources of vitamins B1, B3, and B6. Not only are they healthy, but they are also great for snacking. Leafy green vegetables, such as spinach and broccoli, contain vitamin B9 and many other nutrients necessary for the body.

Fish, especially salmon and tuna, are rich in vitamins B3 and B12, as well as omega-3 fatty acids, which promote heart health. Meat, especially beef and chicken, is an excellent source of vitamins B3 and B6, which play important roles in metabolism. Fruits such as avocados and bananas also contain B vitamins, including B6, which helps produce serotonin and supports emotional health. Including these foods in your diet will help ensure you get the necessary B vitamins and maintain overall health. The dangers of vitamin A deficiency include: Symptoms of vitamin A deficiency can vary in severity. Some people experience them very clearly, while others may have more subtle symptoms. It is important to consider individual characteristics, as deficiency symptoms may depend on overall health, diet, and absorption of vitamin A. Regular monitoring of your condition and consultation with a doctor will help promptly identify a deficiency of this important vitamin and prevent possible complications.

Retinol, the active form of vitamin A, is found in various foods, dietary supplements, and medications. The name "retinol" comes from the Latin word "retina," meaning the retina of the eye. Within this layer of the eye, retinol is converted to retinal, a molecule sensitive to light. Retinal combines with the protein opsin to form the visual pigment rhodopsin. This pigment plays a key role in the perception of light and color, ensuring the normal functioning of the visual system. Vitamin A, due to its effect on eye health, is an essential nutrient necessary for maintaining good vision and protecting against various diseases.

Vitamin A deficiency causes a disruption in the synthesis of visual pigments. As a result, the rods and cones responsible for visual acuity and color perception begin to function abnormally. This leads to the development of "night blindness," in which a person loses the ability to see and distinguish objects in low light conditions. If vitamin A deficiency is not corrected, it can eventually lead to complete blindness in the dark. It is important to monitor vitamin A levels to prevent serious vision problems. People who spend long periods of time looking at electronic devices often experience eye discomfort. This can be caused by simple fatigue, but sometimes a vitamin A deficiency is the culprit. Vitamin A plays a key role in maintaining eye health and preventing vision problems. To reduce the risk of discomfort, it is important not only to take regular breaks from working at a computer but also to monitor your diet, including foods rich in vitamin A, such as carrots, spinach, and sweet potatoes. Taking care of your eye health should be a priority in today's digital world.

Retinol plays a vital role in maintaining a healthy tear film. A deficiency of this vitamin in the body leads to poor hydration of the mucous membrane of the eye and cornea, which increases the risk of dry eye. This condition not only causes discomfort but can also lead to serious consequences, such as corneal ulceration and vision problems, which can manifest themselves not only in low-light conditions. Maintaining optimal retinol levels is essential to prevent these complications and ensure the normal functioning of the visual system.

In 1928, scientists discovered that vitamin A has anti-infective properties. Modern research confirms that vitamin A is important for the immune response to infections. It supports local immunity of the mucous membranes of the respiratory and gastrointestinal tract. A lack of vitamin A leads to a weakened immune system, which significantly increases the risk of developing colds and intestinal infections. Therefore, it's important to ensure adequate vitamin A intake to maintain health and prevent infectious diseases.

Vitamin A plays a key role in the formation of new immune cells, such as B and T lymphocytes. These cells actively recognize and engulf foreign substances and produce antibodies to fight infections. Furthermore, vitamin A prevents excessive immune inflammation, which can lead to damage to the body's own cells. Retinol's anti-inflammatory properties are due to its antioxidant activity, which helps neutralize free radicals. Thus, vitamin A is an important element for maintaining a healthy immune system and protecting the body from infections.

How much vitamin A do you need per day?

The US National Institutes of Health sets recommendations for vitamin A intake in retinol equivalents. According to these standards, 1 mcg of retinol equivalent (RAE - Retinol Activity Equivalents) is equal to 1 mcg of retinol and 12 mcg of dietary beta-carotene. Vitamin A plays an important role in maintaining health, including vision, the immune system, and cell division. Proper intake of vitamin A is essential to prevent deficiency and related diseases.

What foods contain vitamin A?

Active vitamin A comes mainly from animal products, while provitamins of this group can be found exclusively in plant foods. Including both animal sources of vitamin A and plant provitamins in the diet helps to fully provide the body with the necessary nutrients.

Carotenoids are absorbed from the intestines less efficiently than retinol. Of the total amount of beta-carotene, no more than one-sixth is absorbed. Therefore, it is recommended to combine animal and plant products for optimal absorption of these nutrients. This will improve overall health and increase vitamin levels in the body.

We have compiled a table showing 15 foods rich in vitamin A. Vitamin A plays an important role in maintaining the health of the eyes, immune system, and skin. Eating these foods will help you get the necessary amount of this important vitamin.

Liver is the richest source of vitamin A. Just one 85-gram serving of this product completely satisfies the body's weekly requirement for this vitamin. Including liver in your diet can significantly help maintain the health of the eyes, immune system, and skin due to its high vitamin A content.

According to recommendations from the USDA, beef liver should be refrigerated and consumed within one to two days of purchase. If you do not plan to cook it within this period, it is recommended to freeze the liver. When properly frozen, it can retain its flavor and nutritional value for 3-4 months. Proper storage of beef liver prevents loss of freshness and prevents bacterial growth, which is especially important for health.

Pate is a valuable source of retinol, iron, and vitamin B12, making it an excellent choice for recuperating after an illness. However, if you are monitoring your cholesterol levels, you should limit your consumption of liver pate.

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Vitamin B12 plays a key role in maintaining health, especially for the nervous system and hematopoiesis. To ensure sufficient amounts in the diet, it is important to include foods rich in this vitamin.

These foods include meat, especially beef and liver, which contain high concentrations of vitamin B12. Fish is also an excellent source: mackerel, salmon, and tuna are rich in this vitamin. Dairy products such as milk, yogurt, and cheese provide additional vitamin B12, especially for those following a plant-based diet. Eggs also contain significant amounts of this vitamin, making them a valuable food for maintaining health.

Furthermore, fortified foods such as cereals and plant-based milks can be a good source of vitamin B12 for vegetarians and vegans. Including these foods in your diet will help maintain optimal vitamin B12 levels and prevent deficiency.

Make sure your diet is varied and includes all the necessary sources of vitamin B12 to maintain health and well-being.

Eel, also known as unagi, is one of the highest sources of the active form of vitamin A and is popular in Japanese cuisine. In Japan, there is a tradition of celebrating Eel Day according to the ancient Japanese calendar. On this day, the Japanese eat unagi, believing that it helps maintain vitality and energy. Eel is not only delicious but also healthy, making it an important part of Japanese culture and gastronomy.

Pumpkin is a dietary and low-calorie product. One serving of this vegetable contains approximately 120 kcal, making it an excellent choice for those who watch their diet. In addition, pumpkin provides the body with a significant amount of vitamin A in the form of beta-carotene, exceeding the daily requirement. Including pumpkin in your daily diet can help improve your health and maintain a healthy weight. Green vegetables may contain orange beta-carotene, which may seem unusual. This is because dark green leafy vegetables contain a large amount of the green pigment chlorophyll, which masks the orange pigment. Just one serving of cooked spinach (180 grams) can provide the daily requirement for beta-carotene, making it a valuable source of this important vitamin. Including spinach in your diet can help boost antioxidant levels and improve overall health. Carrots are recommended to be eaten raw, as cooking reduces their beta-carotene content. One medium-sized raw carrot provides 74% of the daily requirement for vitamin A. Vitamin A plays an important role in maintaining healthy eyes, the immune system, and skin. Therefore, to maximize the benefits of carrots, it's best to include them in your diet fresh.

Tuna is a valuable product that's worth including in your diet for several reasons. Firstly, bluefin tuna is rich in the active form of vitamin A. Just one serving (85 grams) provides approximately 70% of your daily retinol intake. Secondly, tuna contains healthy fats, which help improve and accelerate the absorption of vitamin A in the intestines. Including tuna in your diet not only enriches your diet with essential vitamins but also supports health thanks to its high content of essential fatty acids.

A cup of beet greens provides half the daily requirement for vitamin A. They can be used to prepare a variety of dishes, such as soups or salads. Beets are also a good source of vitamin A, but they are less beneficial due to their oxalic acid content. Oxalic acid interacts with calcium and vitamin C to form oxalates, which, when consumed in excess, can cause kidney stones. Therefore, it is important to consume beets and their greens in moderation to avoid potential health problems.

Breakfast cereals often contain fortified vitamins and minerals, including vitamin A. Eating one serving of such cereal (30 grams or a quarter cup) for breakfast can provide 25% of the daily requirement for vitamin A. This makes fortified breakfasts an excellent option for maintaining health and nutrition. It is important to choose foods that contain essential vitamins and minerals to provide the body with all the necessary elements for an active day.

Broccoli is a versatile food that can be used in a variety of dishes. It can be eaten raw in salads, cooked in soups or casseroles, and also served as a side dish with fish and meat. One serving of broccoli provides 21% of the daily value of beta-carotene, making it a valuable source of this important antioxidant. Including broccoli in your diet helps improve nutrition and maintain health thanks to its high content of vitamins and minerals.

Sweet red peppers are recommended to be eaten raw, making them an excellent ingredient for salads. One large bell pepper contains the same amount of beta-carotene as spinach, making it a valuable product for maintaining health. Including sweet red peppers in your diet helps improve vision and strengthen the immune system thanks to their high content of antioxidants and vitamins.

200 grams of Greek yogurt contains 20% of the daily value of vitamin A. Vitamin A is present in all dairy products, but Greek yogurt stands out due to its low calorie content. It is also suitable for people with lactose intolerance, as the level of milk sugar in Greek yogurt is significantly lower compared to other dairy products. This makes Greek yogurt an excellent choice for maintaining health and a balanced diet.

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Lactose intolerance is a condition in which the body is unable to digest lactose, a natural sugar found in dairy products. This occurs due to a deficiency of the enzyme lactase, which is needed to digest lactose. Symptoms of intolerance may include bloating, gas, diarrhea, and abdominal pain after consuming dairy products.

According to statistics, lactose intolerance affects a significant portion of the population. About 65% of adults worldwide have some degree of lactose intolerance. This problem is most common among people of Asian, African, and South American descent, while cases of intolerance are less common in European and North American populations.

Note that lactose intolerance should not be confused with a milk allergy, which is an immune reaction to the proteins found in milk. If you suspect you have lactose intolerance, it is recommended to consult a doctor for diagnosis and dietary recommendations. Various dairy alternatives, such as lactose-free milk and plant-based alternatives, can help avoid unpleasant symptoms.

Ricotta is a cheese made from goat's milk. It pairs beautifully with fresh fruits, leafy greens, and fish. Goat cheese contains less lactose than cow's milk cheeses, making it more suitable for people with lactose intolerance. Additionally, half a cup of ricotta (124 grams) contains 17% of the active vitamin A, making it a valuable addition to the diet. Ricotta is not only delicious but also healthy and can be used in a variety of culinary recipes.

Goat cheese has a shelf life of approximately two weeks when unopened and 5-7 days after opening. To prevent cheese from spoiling, it's recommended not to leave it at room temperature for more than two hours. Proper storage of goat cheese will help preserve its freshness and flavor.

Two large boiled eggs contain 16% of the daily value of retinol, an important vitamin A. However, the vitamin A content in eggs can be increased up to 10 times if hens are given special retinol supplements. This increases the nutritional value of the eggs and provides the body with essential nutrients.

Dried apricots are not only a tasty treat but also a source of beneficial nutrients. Just one 40-gram serving provides 8% of the daily value of vitamin A. However, it is important to remember the high calorie content of dried fruits, which should be taken into account when consuming them.

Why is it better to get vitamin A from food?

Taking additional vitamin A in the form of dietary supplements may seem like an effective way to improve vision and maintain overall health. However, it is important to remember that retinol should not be taken without a doctor's recommendation. Because vitamin A is fat-soluble, it can accumulate in the body, and its excess, known as hypervitaminosis A, can cause serious consequences. Symptoms of acute hypervitaminosis A can occur after taking too much retinol at one time. This condition is similar to severe food poisoning and is accompanied by unpleasant sensations. Therefore, it is important to take vitamin A with caution and follow medical advice.

nausea;
vomiting;
diarrhea;
loss of appetite;
drowsiness;
irritability;
abdominal pain;
peeling skin.

Chronic hypervitaminosis occurs as a result of prolonged consumption of vitamin A in amounts exceeding the daily requirement. This condition can lead to a number of serious health problems, such as liver dysfunction, skin rashes, headaches, and vision problems. It is important to monitor vitamin A levels in the body and avoid excess consumption to prevent the development of hypervitaminosis and maintain overall health. It is recommended to consult a doctor before starting to take supplements containing vitamin A to determine the optimal dosage and prevent possible complications.

coarse hair;
eyebrow loss;
rough and dry skin;
dry eyes;
chapped lips;
increased intracranial pressure;
general and unexplained weakness;
osteoporosis (decreased bone density) and the associated increased risk of fractures;
severe headache;
joint pain;
developmental disorders in children.

Taking vitamin A without medical supervision during pregnancy is especially dangerous: high doses of retinol can lead to congenital defects in the child.

After normalizing the level of retinol in the body, these symptoms, with the exception of developmental defects, usually disappear within a month. It's important to note that retinol plays a key role in maintaining healthy skin, vision, and the immune system. Maintaining optimal levels of this vitamin promotes overall health and accelerates recovery. It's extremely difficult to obtain excess vitamin A from regular foods that aren't fortified with this vitamin. The exception is the liver of animals living in northern regions, such as polar bears and seals. If your diet doesn't include the liver of these animals, you don't have to worry about a possible "dietary overdose" of vitamin A.

Vitamin A's Key Helper

For vitamin A to function effectively in the body, a sufficient amount of zinc is necessary. Zinc plays a key role in the production of a protein that binds retinol and transports it from the liver to tissues. It is also essential for the functioning of the enzyme that converts retinol into active retinal. Providing the body with sufficient zinc promotes the effective absorption of vitamin A and its biological activity.

Correction of vitamin A deficiency may require not only the use of dietary supplements but also an increase in the consumption of zinc-rich foods. Zinc plays an important role in the metabolism of vitamin A and promotes its absorption by the body. Including foods such as meat, seafood, nuts, and legumes in your diet will help not only improve vitamin A levels but also support overall health. Therefore, to solve the problem of vitamin A deficiency, it is worth paying attention to a balanced diet, including zinc-containing foods.

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Zinc is an essential mineral required for normal body function. It is involved in numerous biochemical processes, including immune system support, wound healing, and protein synthesis. Including zinc-rich foods in your diet can significantly improve your health.

Foods containing zinc include meat, seafood, legumes, nuts, and seeds. Red meat and poultry are among the best sources of zinc. Oysters and other seafood also contain high concentrations of this mineral. Legumes, such as lentils and chickpeas, and nuts, such as cashews and almonds, are also good sources of zinc.

Grains, such as quinoa and oatmeal, may contain zinc, but it is important to note that the phytic acid in them can reduce its absorption. Vegetarians and vegans can consider sources such as pumpkin and sunflower seeds, as well as dark chocolate, which, in addition to zinc, contains many antioxidants.

It is important to balance your diet and include a variety of zinc sources to meet the daily intake of this important mineral. Optimal zinc levels in the body contribute to improved overall well-being and increased resistance to disease. Pay attention to foods high in zinc and include them in your diet to maintain health.

Sample menu for getting vitamin A

For people working in mental professions, the average daily energy expenditure usually does not exceed 2800 kcal. Based on this figure, you can create a simple and balanced menu for the day. Proper nutrition is important for maintaining energy and concentration throughout the workday. Including protein, carbohydrates, and healthy fats in your diet will help optimize mental performance and increase productivity.

170 g (2 servings) of animal product, such as fish, per day, or 2 servings of beef liver once a week;
25 g of butter;
30 g of cheese;
500 ml of dairy product (kefir or yogurt).

Butter can be replaced with vegetable oil, but it is important to maintain a balance of fats in the diet. Fats play a key role in the absorption of vitamins, such as vitamin A, which is better absorbed in the intestines in the presence of fats. Therefore, when replacing butter with vegetable oil, do not forget the need to include healthy fats in your diet for optimal absorption of essential vitamins.

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Thirunavukarasu A. J., Ross A. C., and Gilbert R. M. in their article "Vitamin A, Systemic T Cells, and the Eye: Focus on Retinal Degenerative Diseases" examine the effect of vitamin A on immune processes in the eye, particularly in the context of retinal degenerative diseases. The publication appeared in the journal Frontiers in Nutrition in 2022, highlighting the importance of vitamin A for maintaining retinal health and its role in the immune system. DOI: 10.3389/fnut.2022.914457.

Orlova S. V., Nikitina E. A., Karushina L. I., Pigareva Yu. A., Pronina O. E. in their article "Vitamin A: Position of a Nutritionist", published in the journal "Medical Alphabet" in 2020, examine the importance of vitamin A for human health. The study covers its role in maintaining the normal functioning of the body, including vision, the immune system, and reproductive health. Vitamin A is an essential component of the diet, and its deficiency can lead to serious consequences. The authors emphasize the need for a balanced diet and possible sources of vitamin A, such as carrots, liver, and greens. The article provides valuable information for dietetics and healthcare professionals, focusing on the importance of vitamins for overall well-being. DOI: https://doi.org/10.33667/2078-5631-2020-21-49-57

Zelenskaya E. M. and Lifshits G. I. investigate the genetic prerequisites for decreased serum retinol levels in their article published in the journal "Pharmacogenetics and Pharmacogenomics" in 2019. The work considers the mechanisms influencing retinol concentration and their relationship with individual genetic characteristics. This study highlights the importance of genetic analysis for understanding vitamin metabolism and their role in the body. The article is available at DOI: 10.24411/2588-0527-2019-10036.

Shamitova E. N., Viktorovich N. N. conducted a study on the effect of vitamin A deficiency on the physiological state of the lungs. An article published in the journal "Modern Problems of Science and Education" in 2019, No. 4, examines the consequences of a deficiency of this important vitamin on respiratory health. Vitamin A deficiency can have a negative impact on lung function, which highlights the need for its adequate intake to maintain normal physiological state of the respiratory system. The study highlights the importance of vitamin A in the prevention of lung diseases and improving overall health.

Simoni, Robert, Hill, Robert, and Vaughan, Martha. (2002). Nutritional biochemistry and vitamin discovery: the work of Elmer Werner McCollum. Journal of Biological Chemistry, 277, e8-e10. doi: 10.1016/S0021-9258(19)60665-4.

This article discusses the contributions of Elmer Werner McCollum to the study of vitamins and their role in nutritional biochemistry. McCollum's research laid the foundation for understanding the importance of vitamins in nutrition and their impact on human health.

Vitamin A was discovered in the early 20th century during research aimed at understanding its impact on human health. This essential micronutrient plays a key role in maintaining normal vision, immune system function, and skin health. The discovery of vitamin A was a significant step in nutritional science, as it was the first vitamin to be identified and studied. Research showed that vitamin A deficiency can lead to serious health problems, including night blindness and poor skin condition. Over time, a link was established between vitamin A consumption and the prevention of various diseases, making it an essential element in the human diet. Vitamin A is found primarily in animal products such as liver, milk, and eggs, as well as in plant sources in the form of carotenoids, which the body can convert into the active form of the vitamin. Ensuring adequate vitamin A intake is important to maintain overall health and prevent disease.

Lenahan C., Sanghavi R., Huang L., Zhang J. H. in their article "Rhodopsin: A Potential Biomarker for Neurodegenerative Diseases", published in the journal Frontiers in Neuroscience in 2020, discuss the role of rhodopsin as a potential biomarker for neurodegenerative diseases. The study highlights the importance of rhodopsin in the diagnosis and monitoring of diseases such as Alzheimer's disease and Parkinson's disease. The authors analyze the molecular mechanisms of rhodopsin action and its possible pathways of interaction with neural processes, which opens new horizons for future research in the field of neuroscience. DOI of the article: 10.3389/fnins.2020.00326.

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Miyazono S., Isayama T., Delori F. C., and Makino C. L. conducted a study in which they found that vitamin A activates rhodopsin and increases its sensitivity to ultraviolet light. The results of the study were published in the journal Vision Research Neuroscience in 2011, volume 28, issue 6, pages 485–497. DOI: 10.1017/S0952523811000423. This discovery underscores the importance of vitamin A for visual function and its role in retinal photosensitivity.

Klyuchnikov S. O., Gnetneva E. S., and Nechaeva N. L. in their article "Vitamin A and β-carotene: feasibility of use in pediatric practice" examine the role of vitamin A and β-carotene in children's health. This material was published in the Speransky journal "Pediatrics" in 2007, volume 86, issue 6, pages 22. The authors emphasize the importance of these substances for the normal development of children and also discuss recommendations for their use in pediatric practice. The study highlights the need for proper nutrition and the possibility of correcting vitamin balance in children with supplements containing vitamin A and β-carotene.

Alam J., Yu Z., de Paiva C. S., and Pflugfelder S. C. investigate the effect of retinoids on the regulation of innate ocular surface inflammation. In their article, published in the journal "International Journal of Molecular Sciences" in 2021, the authors examine the mechanisms by which retinoids can influence inflammatory processes occurring on the ocular surface. The research presented in the article highlights the importance of retinoids in maintaining ocular health and opens up new perspectives for the treatment of diseases associated with inflammation. The full text of the article is available at DOI: 10.3390/ijms22031092.

Sirisinha S. investigates the multifunctional role of vitamin A in the regulation of the mucosal immune system. A 2015 article published in the Asian Pacific Journal of Allergy and Immunology examines the mechanisms by which vitamin A influences the immune response in mucous membranes. The work highlights the importance of vitamin A for maintaining health and its impact on immune responses, making it a key element in the prevention and treatment of allergic and immune diseases. Hodge C. and Taylor C. presented a review of vitamin A deficiency that was updated on January 2, 2023. This material is published in StatPearls, available online. The publication is hosted by Treasure Island, Florida, and continues to be updated in 2025. Vitamin A deficiency is a serious problem that can lead to a variety of diseases and negatively impact health. It is important to understand the importance of vitamins for the body and monitor their levels to maintain overall health.

Labygina A. V., Kolesnikova L. I., Grebenkina L. A., Darenskaya M. A., Kurashova N. A., Dolgikh M. I., Semenova N. V., Natyaganova L. V., and Druzhinina E. B. reviewed the literature on retinol content and its effect on reproductive disorders in residents of Eastern Siberia. An article published in the journal "Human Ecology" in 2018 examines the results of studies that highlight the importance of retinol for the health of the region's population. This work focuses on the relationship between retinol levels and reproductive health, which may be useful for further research and preventive measures.

The World Health Organization (WHO) reports vitamin A deficiency as a serious global problem. A deficiency of this essential micronutrient can lead to various diseases and a weakened immune system. Vitamin A plays a key role in maintaining healthy skin, vision, and overall body function. Its deficiency is most common in developing countries and can cause blindness, especially in children. It is important to raise awareness of the importance of vitamin A and how to obtain it through a varied diet, including vegetables, fruits, and animal sources. Maintaining adequate levels of vitamin A in the diet is an important step toward improving public health and preventing deficiency-related diseases. VanBuren C. A. and Everts H. B., in their article "Vitamin A in Skin and Hair: An Update," published in the journal Nutrients in July 2022, examine the effects of vitamin A on skin and hair health. Vitamin A plays a key role in maintaining the cellular structure and function of the skin, as well as in the process of hair growth and restoration. The authors emphasize that adequate amounts of this vitamin can help improve skin condition, prevent skin aging, and maintain healthy hair. The study confirms the importance of vitamin A in the diet, especially for people seeking to improve the condition of their skin and hair. The article is available at DOI: 10.3390/nu14142952 and may be useful for specialists in the fields of dermatology and nutrition. El-Akawi Z., Abdel-Latif N., Abdul-Razzak K. conducted a study examining the effect of plasma vitamin A and E levels on acne skin condition. The results of the study, published in the journal Clinical and Experimental Dermatology in May 2006, showed that the concentration of these vitamins may influence acne manifestations. The article is available at DOI: 10.1111/j.1365-2230.2006.02106.x, and the PMID of the study is 16681594.

Palace, V. P., Haper, N., Qing, C., and Singhal, P. K. investigated the antioxidant properties of vitamin A and carotenoids and their relationship to cardiovascular disease. The article, published in Free Radical Biology and Medicine in March 1999, examines the mechanisms of action of these substances and their potential role in the prevention of heart disease. Antioxidants such as vitamin A and carotenoids may help reduce oxidative stress, which is one of the risk factors for cardiovascular disease. DOI: 10.1016/s0891-5849(98)00266-4. PMID: 10218665.

Rogers M. A., Chen J., Nallamshetty S., Pham T., Goto S., Muehlschlegel J. D., Libby P., Aikawa M., Aikawa E., and Plutzky J. conducted a study on the effect of retinoids on the calcification of human cardiovascular cells. The results, published in the journal Arteriosclerosis, Thrombosis, and Vascular Biology in March 2020, show that retinoids suppress calcification of these cells. The work also presents data on the various effects of selective retinoid modifiers. The article is available at DOI: 10.1161/ATVBAHA.119.313366 and has PMID 31852220, PMCID PMC7047603. These findings highlight the importance of retinoids in cardiology and their potential use in the treatment of cardiovascular disease.

Vitamin A and Carotenoids: Information for Healthcare Professionals

Vitamin A plays a key role in maintaining health, including vision, immune function, and skin health. It exists in two forms: the vitamin A precursor, beta-carotene, found in plant foods, and active forms, such as retinol, found in animal sources.

Carotenoids, a group of pigments present in fruits and vegetables, are also important for health. They have antioxidant properties and may reduce the risk of chronic diseases. The best-known carotenoids include beta-carotene, lycopene, and lutein.

Adequate intake of vitamin A and carotenoids is essential for maintaining optimal health. The recommended daily allowance for adults varies by age and gender. Primary sources of vitamin A include liver, dairy products, eggs, and fish, while carotenoids can be found in carrots, sweet potatoes, spinach, and other colorful vegetables and fruits.

A lack of vitamin A can lead to serious health problems, including poor vision and a weakened immune system. However, too much vitamin A, especially in supplement form, can be toxic. Therefore, it is important to follow nutritional guidelines and get the nutrients you need from a varied diet.

Understanding the role of vitamin A and carotenoids in nutrition can help healthcare professionals advise patients on the right approach to maintaining good health through diet.

The U.S. Department of Agriculture offers FoodData Central, a resource for information on beef liver. This resource provides nutritional data, composition, and calorie content for beef liver, making it a valuable tool for dietitians and consumers. Beef liver is known for its high content of vitamins and minerals, including vitamin A, iron, and B vitamins. Including this product in your diet can help improve overall health due to its nutritional value. For detailed information about beef liver and its health benefits, visit FoodData Central.

Food safety in the United States is an important topic, covering various aspects, including food production, processing, distribution, and consumption. The primary organizations involved in ensuring food safety are the Food and Drug Administration (FDA) and the United States Department of Agriculture (USDA). These agencies develop and implement strict standards and regulations aimed at protecting public health.

Maintaining food safety standards includes regular inspections, monitoring of production processes, and traceability of products from farm to table. Consumers also play a key role in ensuring food safety by properly storing and preparing foods, paying attention to expiration dates, and paying attention to packaging conditions.

It is important to note that food safety not only protects public health but also maintains confidence in products in the marketplace, which in turn contributes to the sustainable development of the agricultural sector and the economy as a whole. Due to globalization and increasing imports, food safety issues are becoming increasingly important, requiring regulators to continually update standards and control methods.

Ensuring food safety is essential for preventing food-related illnesses and maintaining overall public health.

The U.S. Department of Agriculture provides food information through FoodData Central, including liverwurst spread. This product is a deli meat often used in cooking. Liver spread is a source of protein and vitamins, such as vitamin A and B complex, making it a popular choice for many dishes. For more detailed nutritional information on liver pate, visit FoodData Central.

The U.S. Department of Agriculture provides nutritional data for a variety of foods through FoodData Central. One such food is cooked pumpkin. This vegetable is rich in vitamins, minerals, and nutrients, making it an excellent choice for a healthy diet. Cooked pumpkin is low in calories, but has high nutritional value due to the presence of fiber and antioxidants. Information on cooked pumpkin is available in the FoodData Central database, allowing users to obtain up-to-date data on its composition and health benefits.

24. U.S. Department of Agriculture. FoodData Central. Spinach, cooked, drained, without salt.

Hwang E. S., Stacewicz-Sapuntzakis M., and Bowen P. E. investigated the effect of heat treatment on the composition of carotenoids and tocopherols in tomatoes. In a paper published in the Journal of Food Science in October 2012, the authors present findings showing how different cooking methods affect the nutrients in tomatoes, which has important implications for the food industry and consumer health. The study highlights the need to optimize cooking processes to preserve the beneficial properties of tomatoes. DOI: 10.1111/j.1750-3841.2012.02909.x. PMID: 22950575.

The U.S. Department of Agriculture provides nutrition information for carrots cooked by boiling without added salt. FoodData Central provides information on calories, vitamin and mineral content, and other health benefits of carrots. This food is an excellent source of beta-carotene, vitamin K, and fiber, making it an important component of a healthy diet. Cooked carrots retain their nutrients, making them suitable for use in a variety of recipes. Explore FoodData Central for more detailed information about carrots and their role in the diet.

The U.S. Department of Agriculture provides nutrition information on foods through its FoodData Central platform. In particular, data on tuna, fresh bluefin tuna prepared using the dehydration method, may be especially useful for those watching their diet. This type of fish is an excellent source of protein and omega-3 fatty acids, making it a popular choice among those seeking a healthy lifestyle. Nutrition information for tuna helps consumers make informed decisions about their diet.

A. I. Parfenov, N. A. Bodunova. Metabolic Disorders in Vitamin Malabsorption. Farmateka, 2014, No. 6. This study examines the mechanisms leading to metabolic disorders due to inadequate vitamin absorption. The clinical manifestations and consequences of malabsorption are analyzed, as well as diagnostic methods and possible treatment approaches. This article will be of interest to specialists in gastroenterology and nutrition, emphasizing the importance of vitamins in maintaining metabolism and overall health.

The U.S. Department of Agriculture presents FoodData Central, where you can find information on the nutritional value of various foods. The section on boiled beet greens contains information on their composition and health benefits. Beet greens are an excellent source of vitamins and minerals, making them an important element of a balanced diet. Eating boiled beet greens can promote overall health due to their high antioxidant and fiber content. Exploring the information on FoodData Central will help you better understand the benefits of beet greens and incorporate them into your diet.

Oxalate Nephropathy Due to Juice Consumption: A Case Report and Review. A study by Jane E. Getting et al. was published in The American Journal of Medicine, Volume 126, Issue 9, Pages 768–772. This paper examines a rare condition associated with high oxalate levels resulting from excessive consumption of oxalate-rich juices. The authors describe a patient's case and review the existing literature on the topic, emphasizing the importance of understanding the potential risks associated with juice-based diets. The study highlights the need for mindful dietary choices and awareness of the potential health problems associated with excess oxalate consumption. The U.S. Department of Agriculture provides food information through FoodData Central. Specifically, the section on ready-to-eat cereals includes information on POST Bran Flakes. These cereals are a popular choice for those looking for a healthy breakfast rich in fiber and nutrients. Information on the composition and nutritional value of this product will help consumers make informed choices for their diet.

Cooked broccoli raab is an important source of nutrients and vitamins. According to the U.S. Department of Agriculture, this vegetable contains many beneficial substances, including vitamins A, C, and K, as well as minerals such as calcium and iron. Broccoli raab has a unique flavor and can be used in a variety of dishes, from salads to side dishes. Cooking it allows it to retain most of its nutritional properties, making it an excellent choice for a healthy diet. Including broccoli raab in your diet helps maintain overall health and strengthen the immune system, thanks to its high antioxidant content.

The U.S. Department of Agriculture provides food information through FoodData Central. In particular, data on raw sweet red peppers includes their nutritional properties, calories, and other important metrics. Sweet red peppers are a low-calorie vegetable rich in vitamins and minerals, such as vitamin C and fiber. It is often used in cooking due to its sweet flavor and vibrant color. Information about sweet red peppers can be useful for both dietitians and those watching their diets.

The U.S. Department of Agriculture (USDA) provides extensive food data through the FoodData Central platform. In particular, plain and low-fat Greek yogurt is a popular choice for those watching their diets. It is rich in protein and calcium, making it an excellent option for a nutritious diet. Greek yogurt can be used in a variety of recipes, from smoothies to desserts, and as a base for healthy dressings and sauces. Proper use of this product can promote better digestion and overall health.

The U.S. Department of Agriculture provides food data through FoodData Central. This resource provides information on ricotta made from whole milk. Ricotta is a popular cheese often used in cooking due to its creamy texture and versatility. It's rich in protein and calcium, making it a healthy choice. FoodData Central provides information on the nutritional content of ricotta, as well as its calorie content and other characteristics, helping consumers make informed choices when shopping.

The U.S. Department of Agriculture presents FoodData Central, where you can find nutritional information on eggs. Specifically, it features information on boiled eggs, which are an excellent source of protein and other nutrients. Boiled eggs provide important vitamins and minerals, including vitamin D, vitamin B12, and selenium. Educational materials and research available on FoodData Central help better understand the health benefits of eggs and their role in a balanced diet.

Péhault-Godbert S., Guyot N., Nys Y. in their article "The Golden Egg: Nutritional Value, Biological Activity, and Emerging Benefits for Human Health" explore the importance of chicken eggs in the human diet. Published in the journal Nutrients in March 2019, the work highlights the high nutritional value of eggs, their role in maintaining health, and potential therapeutic properties. Eggs contain many vitamins, minerals, and beneficial fatty acids that help normalize metabolism and strengthen the immune system. DOI: 10.3390/nu11030684. PMID: 30909449; PMCID: PMC6470839.

U.S. The Department of Agriculture offers extensive nutritional information for a variety of foods, including dried apricots. FoodData Central provides information on the vitamin, mineral, and other nutrient content of dried apricots. These fruits are a source of fiber, antioxidants, and vitamins, making them a healthy addition to the diet. Dried apricots may help improve digestion and support heart health. Explore the nutrition facts to learn more about dried apricots.

MSD Manual: Hypervitaminosis A

Hypervitaminosis A is a condition that occurs when you consume too much vitamin A. This vitamin is essential for normal body function, but too much can have serious health consequences. Symptoms of hypervitaminosis A may include headache, nausea, vomiting, and liver problems.

The main sources of vitamin A are animal products, such as liver, dairy products, and fish, as well as plant foods containing beta-carotene. It is important to monitor the balance of vitamin intake to avoid negative consequences.

If you suspect hypervitaminosis A, you should consult a doctor for an examination and recommendations for adjusting your diet. Preventive measures include conscious vitamin intake and adherence to the standards recommended by specialists.

Food Hygiene: A Complete Guide for Doctors. Author: A. A. Korolev. Publisher: GEOTAR-Media, Moscow, 2016. Volume: 624 pages. This publication is a comprehensive guide to food hygiene, covering the key aspects that medical professionals need to ensure the health of their patients. The book includes up-to-date data, recommendations, and practical advice, making it an indispensable resource for doctors and healthcare professionals.

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