Vitamin A is a food concept that refers to a particular family of structurally related substances.
Under this vitamin, it means retinol, retinoic acid and pro-vitamins from the group of carotenoids like beta-carotene, lycopene and many others.
Vitamin A is one of the fat-soluble vitamins. It is necessary for the growth, development and life of the human body.
The function of this vitamin began back in the early developmental processes, such as embryogenesis.
Furthermore, it is necessary during the whole life to maintain healthy vision, immunity, reproduction …
This vitamin is found in foods of plant and animal origin but is nevertheless concerned different types.
Provitamin beta-carotene comes from plants such as green leafy vegetables or carrot while retinol lies exclusively in animal foods (egg yolk, liver …)
After entering in the body to properly absorb it`s necessary to provide at least some presence of fat in the digestive organs.
Vitamin A we need before we are born
Functions of Vitamin A
Vitamin A is essential for growth, healthy eyes, good vision and night vision because it participates in a photochemical reaction in our retina.
This vitamin is an important part for our health of the mucous membranes.
It also affects the condition of the urinary tract, vagina, lungs, etc.
It`s important part of reproductive functions and nerve function.
It`s very important for our skin. An epidermal differentiation in our body works with the help of vitamin A and oxygen.
It helps for natural skin moisturizer function freely and gives it a fresh look.
The correct reaction of the immune system and control antibodies did not reliably without sufficient amounts of vitamin A.
It acts as an antioxidant, maintains the hormonal balance in women and balance blood sugar.
Vitamin A deficiency – Symptoms
Vitamin A deficiency is first seen through the skin, eyes and immune system.
The first sign of a lack of this vitamin may be impaired vision in the weaker light – the so-called “chicken blindness”.
Then, skin changes (rough and flaky skin).
Later she could have a chronic inflammation (throat, sinuses …) or changes in the mucus.
At the children, vitamin A deficiency leads to stunting and poor formation of bones and teeth.
At pregnancy, the excess and deficiency of this vitamin can result in birth defects.
Male infertility caused by cessation of spermatogenesis, it can also indicate a lack of vitamin A.
Excess – Symptoms
Excessive intake of this vitamin can lead to poisoning in this vitamin and the symptoms include a headache, nausea, blurred vision, peeling of the skin, irritability, drowsiness, hair loss, diarrhea, enlargement of liver and spleen swelling. Excessive intake of beta-carotene may cause yellowish skin changes.
In the elderly often leads to the appearance of excess vitamin A in the body than in younger.
Sources of vitamin A in foods
The richest animal source of vitamin A (NOT FOR VEGAN): liver, fish oil, egg, milk (milk from goat), butter, yoghurt, etc.
The richest vegetable sources of vitamin A: carrot, carrot juice, pumpkin, pumpkin juice, pumpkin seeds, melon, peach, tomato, tomato juice, spinach, broccoli, sweet potato, etc
The other natural sources of Vitamin A are: peppers, rose hip, cherry, Japanese quail eggs, cranberry, grape, dandelion, etc.
NOTE: some sources of Vitamin A is NOT FOR VEGAN.