Avitaminosis and hypovitaminosis

So, for the normal functioning of the human body needs from food-determined amount of vitamins. The demand varies with age, climate, conditions of work, composition of food and some other reasons. Thus, under the influence of cold, at rises to a height, during pregnancy and breastfeeding, infectious diseases, it has improved.
Some vitamins such as A, can be incorporated in the body "in reserve". However, most of them such stocks does not form, and so soon after the cessation get vitamins from food, the body begins to experience the consequences of their lack - start diseases, which are called avitaminosis. They can occur in cases when the body is unable to absorb vitamins (it happens in diseases of the stomach, intestines, liver and pancreas).
Among the most famous avitaminosis include night blindness (beriberi), scurvy (vitamin deficiency), rickets (D-beriberi), and other Signs of these diseases are so characteristic that the doctor can accurately diagnose vitamin deficiency.
It is more difficult to determine the initial form of avitaminosis and those painful conditions that occur in low content of vitamins in food and are called gipovitaminozah States.
First, they are characterized by such vague symptoms, how easy fatigue, reduced working capacity, irritability, loss of appetite, susceptibility to colds, and only later, with the development, gipovitaminozy state become characteristic features such as the propensity to bleeding (With a-vitamin deficiency), violations night vision (with a lack of vitamin a), and other
Throughout the year the content of vitamins in food varies: in summer and autumn it is greater in the winter and spring smaller. So-hypovitaminosis most often develop in winter and especially in spring. The same seasonal nature have hypovitaminosis associated with lack of food vitamin a and D.
Common causes of hypovitaminosis are the increased demand for vitamins, which arises from various reasons (climatic conditions, enhanced physical work, pregnancy), and the violation of absorption and assimilation of vitamins during bowel disease.
What do we know about vitamins and how important each one is to the human body?
To answer this question, we will tell about vitamins, the value of which the human being has already been proven.