Vitamin A (retinol) for vision
Vitamin A is consumed with each light stimulation to synthesize the visual substance rhodopsin, which is primarily responsible for night vision. In bright light, rhodopsin decomposes. It is known that a full recovery in a person takes about 30 minutes. With a lack of vitamin A, there may be a violation of color perception and blurred vision in the dark. It also leads to the drying of corneal cells, and thus to the drying of the conjunctiva (mucous continued century ) and to the risk of disease conjunctivitis .
Herbal products do not contain vitamin A in pure form. But many products contain carotene, from which this important vitamin is formed in the body.
Recommended to maintain normal health - 15.0 mg. To do this, just eat 167 grams of red carrots, or 263 grams of parsley, or 375 grams of dill or 580 grams of wild rose.
The minimum required dose of carotene for an adult is 6.0 mg. Recommended to maintain normal health - 15.0 mg.
To do this, just eat 167 grams of red carrots, or 263 grams of parsley, or 375 grams of dill or 580 grams of wild rose. Agree, in contrast to 375 grams of dill, 167 grams of carrots are mere trifles. Be sure to include in the daily diet, if it is not done. It should be borne in mind that the substance is fat soluble, and therefore it is necessary to add in the diet of vegetable or animal fats (oils).
Pure vitamin A can only be found in animal products.
The minimum required dose of vitamin A for an adult is 1.0 mg. Recommended to maintain normal health - 3.0 mg. It's enough to eat 36 grams of beef liver, or 69 grams of canned cod liver. And you can also have a doctor sausage, at least 30 kilograms =)
It should be borne in mind that heat treatment destroys vitamin A and beta-carotene, reducing their content by 40-80%!
A very important note: vitamin A is toxic, so you need to be careful with it. It is best to consult a doctor. And only after that make a decision to increase the amount of this vitamin in the body.
Unlike vitamin A, beta-carotene, which is converted into active vitamin A in the body, is non-toxic. It can be taken additionally, but given the possibility of the development of hypervitaminosis.
Another important note: vitamin A is able to oxidize. This process can be prevented, or at least reduced, with the help of vitamin E. Therefore, if you have a vitamin E deficiency, you cannot absorb the right amount of vitamin A. Vitamins A and E should be taken together.