Denavir
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FAT-SOLUBLE VITAMINS: VITAMIN A
Nomenclature
Preformed vitamin A exists in three forms: retinol, retinal, and retinoic acid. The precursors of vitamin A are alpha-, beta-, and gamma carotene and cryptoxanthin.
Function
Vitamin A is important (1) for the normal structure of the bones and teeth; (2) for the maintenance of the epithelium or outer layer of the skin, and the mucous membranes that line the nose and respiratory tract, the mouth and gastrointestinal tract, the eyes, the genitourinary tract, and the glands of secretion; and (3) for the formation of visual purple, which enables the retina of the eye to adapt to dim light.
Bile is essential for the absorption of carotenes from the intestines. Mineral oil can seriously interfere with the absorption of vitamin A; if it is used as a laxative, it should not be taken near mealtimes. The liver stores vitamin A and well-nourished individuals usually have a sufficient supply to last for several months.
Recommended allowances
Vitamin A is measured in retinol equivalents (R.E.) and international units (I.U.). The latter designation will no longer be used when food tables have been converted to retinol equivalents.
The allowance for vitamin A from 11 years throughout life is 1000 R.E. (5000 I.U.) for males, and 800 R.E. (4000 I.U.) for females. During pregnancy and lactation the allowances are increased to 1000 R.E. and 1200 R.E., respectively. Intakes ranging from 400 R.E. (2000 I.U.) to 700 R.E. (3300 I.U.) are recommended for infants and children.
Sources
With the many good sources of vitamin A or its precursor, there is little excuse for an inadequate intake. The liver of any animal – beef, veal, Pork, lamb, chicken, turkey – is a rich source. For those who like it, liver once a week or every ten days will go far toward ensuring the full weekly allowance. Fish-liver- oil are excellent sources, but are not generally consumed as foods.
Whole milk, cream, butter, and whole-milk cheeses are good sources of vitamin A. One egg yolk furnishes one tenth of the daily allowance of the adult. Fortified margarine contains the same levels as butter.
Dark green leafy vegetables and deep yellow vegetables and fruits are rich in carotene, which can be converted into vitamin A by the intestinal wall. Among the carotene-rich foods are carrots, sweet potatoes, pumpkin, yellow winter squash, cantaloupe, yellow peaches, apricots, spinach, kale, turnip greens, dark salad greens, broccoli, and green asparagus.
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