What are the effects of too much vitamin A?
Vitamin A plays an important role in vision, bone health and immune system. Too little vitamin can cause vision problems, dry or rough skin and immune system deficiencies, so it is important to adequate daily amounts. However, too much vitamin A may also cause serious problems, from vision disorders to kidney or liver failure.
There are two types of vitamin A: pre -defined vitamin A and provitamin carotenoid. Pre -created vitamin A comes from animal sources such as liver, whole milk and fortified food. Provitamin carotenoid is most of the consumption of vitamin and comes from colored fruits and vegetables. The toxicity of vitamin A is usually caused by the fact that it occupies too much pre -created vitamin A, because it is faster absorbed and slowly cleaned from the body.
Vision changes are the risk of excessive intake of vitamin A. Although vitamin plays a crucial role in maintaining healthy eyes, excessive amounts can cause damage. Blurred VisionAnd sudden changes in vision are common symptoms of vitamin A toxicity A. Small children are also likely to experience double vision.
The chances of the skin may also occur when the individual takes too much vitamin A. While the substance is used in numerous treatment of skin care to combat acne and aging symptoms can cause too dry skin, increased sensitivity to the sun, mouth rupture and peeling. There may also be oily hair or hair loss.
The effects of too much vitamin A are particularly significant in infants and children. Abnormal softening of the bones of the skull or convex fontanelle may occur. Infants may also suffer from the fact that it does not apply, a medical term applied to children whose current weight or total weight gain is significantly smaller than other children of the same age and sex. Take too much vitamin and during pregnancy can Affect the Development of The fetus.
Other potential effects of using too much vitamin A include gastrointestinal disturbances such as nausea, vomiting and reduced appetite. In serious cases, dizziness or loss of consciousness may occur. Excessive levels of vitamin A may cause calcium levels in the body, which in turn can lead to kidney damage.
The recommended daily contribution for vitamin A is listed in international units (IU) and micrograms of the equivalents of retinol (MCG RAE) to take into account the various biological activities of retinol and provitamin carotenoid. Daily recommendations vary depending on age and sex. For example, a child between ages one to three needs about 300 mcg Rae or 1,000 IU vitamin and a day, while an adult woman needs 700 mcg Rae or 2,300 IUs daily. Recommendations may change on the basis of health problems, so a doctor should be consulted to determine the ideal amount.