Vitamin A (retinol and beta-carotene)
β-carotene is the molecule that gives carrots, sweet potatoes, squash, and other yellow or orange vegetables their orange color. It is part of a. Unlike vitamin A, high doses of beta-carotene are not toxic. Effects of vitamin a supplementation on immune responses and correlation with. Learn more about Beta-Carotene uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain Beta-Carotene.
Vitamin A is required for healthy skin and mucus membranes, and for night vision. Its absence from diet leads to a loss in weight and failure of growth in young animals, to the eye diseases; xerophthalmia, and night blindness, and to a general susceptibility to infections. It is thought to help prevent the development of cancer.
Vitamin A and Beta carotene explained
Good sources of carotene, such as green vegetables are good potential sources of vitamin A. Vitamin A is also synthetically manufactured by extraction from fish-liver oil and by synthesis from beta-ionone. Two molecules of vitamin A are formed from on molecule of beta carotene.What is CAROTENE? What does CAROTENE mean? CAROTENE meaning, definition & explanation
If you compare the two molecules, it is clear that vitamin A retinol is very closely related to half of the beta-carotene molecule.
One way in which beta-carotene can be converted to vitamin A is to break it apart at the center and is thought to be most important biologically. The retinal reduced to retinol by retinaldehyde reductase in the intestines. This is the reduction of an aldehyde by the addition of hydrogen atoms to make the alcohol, retinol. Men who have been taking beta carotene supplements for 15 or more years are considerably less likely to experience cognitive decline than other males, researchers from Harvard Medical School reported in Archives of Internal Medicine November issue.
Oxidative stress is thought to be a key factor in cognitive decline, the researchers explained. Studies have shown that antioxidant supplements may help prevent the deterioration of cognition. Their study, involving 4, men, compared those on beta carotene supplements for an average of 18 years to others who were given placebo.
Over the short-term, they found no difference in cognitive decline risk between the two groups of men, but in the long-term it was clear that beta carotene supplements made a significant difference. The researchers emphasized that there may have been other factors which contributed to the slower decline in cognitive abilities among the men in the beta carotene group. Beta carotene keeps lungs healthy as people age The BMJ published a report in March which showed that high blood beta carotene levels compensate for some of the damage to the lungs caused by oxygen free radicals.
They measured the FEV1 of participants and measured their beta carotene blood levels. FEV1 measures how much air you can breathe out in one go. They found that those with high beta carotene levels had much slower decline in FEV1 measures. Which foods are rich in beta carotene? The following foods are rich in beta carotene: Who should take vitamin A? In Australia deficiency of vitamin A is rare as we get enough in our diet.
Beta-Carotene and Vitamin A - the Health Benefits given by carrots
However, your doctor may recommend vitamin A or beta-carotene supplement or cream if you suffer from: Age-related macular degeneration or cataract. Research shows that people who eat more foods with beta-carotene have a lower risk of developing age-related macular degeneration or cataract.
You may need to supplement your diet if you are not eating enough of these foods. Click Here For Article Measles. Vitamin A supplements can reduce the severity and complications of measles in children. However, never give a child vitamin A supplements without a doctor's supervision. Inflammatory bowel disease IBD.
Crohn's disease and ulcerative colitis can interfere with digestion and absorption of nutrients. Your doctor may recommend taking a multivitamin containing vitamin A if you are suffering from nutrient deficiencies. Click Here For Article Acne. A synthetic form of vitamin A called retinoids is used in prescription creams and gels for the treatment of mild to moderate acne, or in Roaccutane capsules for more severe cases of acne.
- What’s the difference between vitamin A and beta-carotene?
- Vitamin A: β-Carotene
Click Here For Article Other skin conditions. Retinoid ointments are available for skin conditions such as chafed skin, cracked heels, cracked nipples, eczema, and sun-damaged and pigmented skin. How much vitamin A? Too much vitamin A can be toxic as it can accumulate in your liver and may result in liver damage.