The requirement for vitamin A can be considered as those amounts which allow certain defend states of nutriture to exist.
Because the absorption efficiency of preformed vitamin in foods is equal to a greater than 90 percent, the dietary requirement is 10 percent higher than the requirement for absorbed vitamin A.
The US recommended Daily Allowance (RDA) of vitamin A for adults is 5000 IU (1000 retinol equivalents).
Main dietary sources of vitamin A are the carotenoids from fruits and vegetables. Rich dietary sources of retinol (preformed vitamin A) include dairy products, eggs and organ meats.
About 100 g of carrots or any of a large variety of green leafy vegetables can meet the daily requirement of vitamin A.
Some carotenoids (found in deep-yellow and dark green vegetables) can be converted to vitamin A during digestion. In the US diet, approximately half of the vitamin A activity is derived from B-carotene and other carotenoids. It is not essential to meet the daily basis requirement on a daily basis because the liver can store about 50 day’s supply of vitamin A.
Excess of vitamin A can cause defects in the fetal bones and central nervous system. Rarely should adult doses exceeding 25,000 IU daily be taken unless a deficiency is especially severe.
Daily requirement for vitamin A
Food science and technology involve the application of essential scientific knowledge and engineering principles to fulfill society's demands for sustainable food quality, safety, and security. This area of study encompasses the analysis of the physical, chemical, and biochemical attributes of food, as well as the principles that govern food processing.
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