Renee attended the University of California, Berkeley and holds an M.S. Vitamin A (retinol, retinoic acid) is a nutrient important to vision, growth, cell division, reproduction and immunity. Your body metabolizes both forms of vitamin A into retinal and retinoic acid. Too much selenium could lead to hair loss , gastrointestinal upset, fatigue , and mild nerve damage .
Food sources can only deliver a limited amount of the vitamin, and your body is great at regulating its own Vitamin D. Our website services, content, and products are for informational purposes only. © 2005-2020 Healthline Media a Red Ventures Company. Symptoms Of Having Too Much Vitamin C. While taking supplements, it has been observed that not the full amount is absorbed. Too much vitamin C or zinc could cause nausea, diarrhea, and stomach cramps. If you have concerns about getting too much vitamin A, NIH recommends you limit your intake of liver and cod liver oil, which have high concentrations of preformed vitamin A.Though liver contains high amounts of vitamin A, you don't need to completely cut it from your diet, unless advised to do so by your doctor. Perhaps one of the best-known functions of vitamin A is its role in vision and Retinal, the active form of vitamin A, combines with the protein opsin to form rhodopsin, a molecule necessary for color vision and low-light vision (It also helps protect and maintain the cornea — the outermost layer of your eye — and the conjunctiva — a thin membrane that covers the surface of your eye and inside of your eyelids (Additionally, vitamin A helps maintain surface tissues such as your skin, intestines, lungs, bladder and inner ear.It supports immune function by supporting the growth and distribution of T-cells, a type of white blood cell that protects your body from infection (What’s more, vitamin A supports healthy skin cells, male and female reproduction and Vitamin A is needed for eye health, vision, immune function, cell growth, reproduction and fetal development.Provitamin A carotenoids such as beta-carotene, alpha-carotene and beta-cryptoxanthin are precursors of vitamin A and have Carotenoids fight free radicals — highly reactive molecules that can harm your body by creating oxidative stress (Oxidative stress has been linked to various chronic illnesses like diabetes, cancer, heart disease and cognitive decline (Diets high in carotenoids are associated with a lower risk of many of these conditions, such as heart disease, lung cancer and diabetes (As mentioned above, vitamin A is essential to vision and eye health.Adequate dietary intake of vitamin A helps protect against certain eye diseases, such as age-related macular degeneration (AMD).Studies show that higher blood levels of beta-carotene, alpha-carotene and beta-cryptoxanthin may reduce your risk of AMD by up to 25% (This risk reduction is linked to carotenoid nutrients’ protection of macular tissue by lowering levels of oxidative stress.Due to their antioxidant properties, carotenoid-rich fruits and vegetables may protect against certain types of For example, a study in over 10,000 adults determined that smokers with the highest blood levels of alpha-carotene and beta-cryptoxanthin had a 46% and 61% lower risk of dying from lung cancer, respectively, than non-smokers with the lowest intake of these nutrients (What’s more, test-tube studies demonstrate that retinoids may inhibit the growth of certain cancer cells, such as bladder, breast and ovarian cancer (It’s also critical for placental health, fetal tissue development and maintenance, as well as fetal growth (Therefore, vitamin A is integral to maternal and fetal health and to those trying to conceive.Vitamin A impacts immune health by stimulating responses that protect your body from illnesses and infections.Vitamin A is involved in the creation of certain cells, including B- and T-cells, which play central roles in immune responses that guard against disease.A deficiency in this nutrient leads to increased levels of pro-inflammatory molecules that diminish Vitamin A positively impacts health by keeping oxidative stress in check, boosting your immune system and protecting against certain diseases.Though vitamin A deficiency is rare in developed countries like the US, it’s common in developing countries, as these populations may have limited access to food sources of preformed vitamin A and provitamin A carotenoids.Vitamin A deficiency can lead to severe health complications.Vitamin A deficiency also increases the severity and risk of dying from infections like measles and diarrhea (Additionally, vitamin A deficiency raises the risk of anemia and death in pregnant women and negatively impacts the fetus by slowing growth and development (Less severe symptoms of vitamin A deficiency include skin issues like hyperkeratosis and acne (Certain groups such as premature infants, people with cystic fibrosis and pregnant or breastfeeding women in developing countries are more at risk of vitamin A deficiency ( Vitamin A deficiency can lead to blindness, increased infection risk, pregnancy complications and skin issues.Preformed vitamin A is more readily absorbed and utilized by your body than plant-based sources of provitamin A carotenoids.Your body’s ability to effectively convert carotenoids, such as beta-carotene, into active vitamin A depends on many factors — including genetics, diet, overall health and medications (For this reason, those who follow plant-based diets — especially Foods high in provitamin A carotenoids like beta-carotene include ( Preformed vitamin A exists in animal foods like liver, salmon and egg yolks, while provitamin A carotenoids are found in plant foods, including sweet potatoes, kale and cabbage.Just as vitamin A deficiency can negatively impact health, getting too much can also be dangerous.
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