Why Vitamin A is So Important?
Vitamin A, the best performing in the class of fat-soluble vitamins. That is not true, but they did name it A. Vitamin A is a little more complicated than other vitamins because it has a provitamin which is two pre-vitamins joined together.
You can see it and how it is joined by looking at the organic chemistry models presented here:
This is interesting in where both the preformed Vitamin A, called Retinols; and the provitamin A, called Beta0carotene are found. Vitamin A is found in animal sources in liver, kidney, egg yolk, cheddar cheese, and butter. Beta-carotene is found in plant sources, mostly leafy green veggies.
Other foods include anything orange (Beta-carotene) like carrots, pumpkin, sweet potato, squash, and dandelions too. Since the Vitamin A in animal sources is performed, it is more likely to cause toxicity than are the plant sources of Beta-carotene. The regulation of Vitamin A synthesis and metabolism is regulated carefully, and therefore plant sources are doubtful to cause any toxicity.
Vitamin A has multiple actions in our systems. Famous for vision, Vitamin A is essential for night-vision especially. So, eating your carrots do help your eyesight. Not only does Vitamin A help our view, but it is also vital for the development of the eye in growing fetuses. Without adequate levels of Vitamin A, babies are sometimes born with abnormal eye development.
Vitamin A deficiency is rare in the industrialized world but is the third most common nutritional deficiency in the world. In a post-grad world, Vitamin A deficiencies and the conditions associated with it would be steadily on the rise. Those with bowel and pancreatic problems and those with cystic fibrosis are also at a much higher likelihood of deficiency. The symptoms of Vitamin A deficiency are abnormal eye scarring, night-blindness, poor bone growth, skin problems, and immune system failure.
Excessive Vitamin A is usually found in those taking “megadose” vitamins or weird fad diets. Sometimes toxicity occurs due to some Vitamins for children being “candy” or “gummy,” and the kid goes nuts and eats the whole bottle. Acute toxicity happens like that often, and therefore all children’ vitamins should be kept secure from their self-dosing.
Symptoms include nausea, vomiting, spinning sensation, blurry vision, drowsiness, and malaise. Chronic toxicity occurs most often from “megadosing” but can also occur in children fed chicken liver daily for longer than a month. Chronic symptoms are similar to acute symptoms but are often non-specific. Constant toxic levels of Vitamin A can cause cirrhosis of the liver.
During development, babies exposed to high levels of Vitamin A circulating in mothers can have congenital disabilities. The dose of exposure is much lower than after birth, as little as 10,000 IU daily. The typical multivitamin has 1000 to 3000 IUs. But again, daily egg yolks with chicken livers and a multivitamin is probably too much for a pregnant or possibly pregnant female. This is one of the survival nutrition issues to pay attention to.
Vitamin A in supplements is usually in Beta-carotene form, and therefore the toxicity is not as likely for the developing infant, and the point is really to watch excessive liver intake in the pregnant female early on in pregnancy to avoid any possibility of congenital disabilities. Only a couple fat-soluble vitamins to go, and it will be on to other subjects, stay tuned and stay strong.