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Intake of the D vitamin at children in older school age
SALZEROVÁ, Eliška
Recent scientific research speaks of the vast importance of Vitamin D concerning our health. It is widely known that vitamin D affects the metabolism of calcium. Moreover, new evidence recently came to light about its positive effects on areas outside the immune system. It also impacts a child's proper growth and development, nervous system functioning, and creation and growth of neurons. Up to 60 % of European children suffer from Vitamin D deficiency. The reason for that can be insufficient intake of vitamin D-rich foods and inadequate time spent outside in the sunshine. I chose four goals for my bachelor's thesis. The first goal is to ascertain the amount of vitamin D that lower secondary school children intake orally. The second is to ascertain the significance of oral vitamin D supplements for lower secondary school children. The third goal is to ascertain the number of products with vitamin D content than lower secondary school children have in their diet. The last goal is to determine what part of dietary reference intake of vitamin D lower secondary school children take in from food. The method I chose to reach those goals was quantitative-qualitative. The sample consisted of 20 lower secondary school children from Písek and surrounding areas. For research methods, I decided on questionnaires and a weekly menu. Questionnaires allowed me to determine the number of products with vitamin D content that each subject consumed and information about potential supplements. The foods listed in the menus were input into the Nutriservis software, which calculated the vitamin D content in microgramms per day and week. Subsequently, I used the weekly vitamin D intake to calculate the percentage of its weekly oral dietary reference intake that the subjects take in. If the subject used supplements, I added that to the overall amount and again calculated the actual vitamin D taken in as a weekly oral dietary reference intake percentage. The questionnaire uncovered concerning products with vitamin D content, lower secondary school children prefer milk, or dairy products, and eggs. Another frequently consumed products were vegetable oils. Fish appeared in the diet once or twice per week. Almost half of the subjects did not eat liver at all. The results of the weekly menu made it clear that supplements are crucial to fulfilling the weekly oral dietary reference intake as, without them, none of the subjects would fulfil the weekly DRI Subjects that did use supplements were successful in 75 % of cases. Weekly oral dietary reference intake was fulfilled by six out of eight subjects using supplements. These results indicate that it is necessary to increase awareness of both children and parents about vitamin D intake.
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Intake of the D vitamin at children at younger school age
PAVLÍČKOVÁ, Adéla
Vitamin D is an integral part of our diet. It is vital for a proper growth and development of a child. It affects development of bones, nervous system activity, neuron creation, and immune system. Currently, around 60% of European children suffer from its deficiency. Insufficient intake of vitamin D from animal sources can be the cause of the deficiency for this group. Up to 90% of vitamin D intake is caused by the sun. Thus, the cause of the deficit can also be the lowered time spent outside. I chose four goals for my bachelor's thesis. The first goal was to ascertain the amount of vitamin D that primary school children intake orally. The second goal I chose was to ascertain the significance of oral vitamin D supplements for primary school children. The third goal was to ascertain the number of products with vitamin D content that primary school children have in their diet. The last goal was to determine what part of dietary reference intake of vitamin D primary school children take in from food. The practical part dealt with the interpretation of the research results. The sample consisted of 20 subjects aged 6 to 12 years old, and the data were gathered in Písek and surrounding areas. The research method I chose was quantitative-qualitative. The data were gathered by questionnaires and menus. The questionnaires helped determine the number of products with vitamin D content that each subject consumed in a week. It also contained a question whether they supplement vitamin D. The menu helped determine the amount of vitamin D taken in from foods in a week. The collected data from menus were subsequently inputted into the Nutriservis software, which calculated the amounts of vitamin D in micrograms from the given foods. From these results, I calculated the overall weekly vitamin D intake and what percentage it made from the weekly oral dietary reference intake of vitamin D. If the subject used supplements, I added it to the calculation of weekly intake and determined the percentage of weekly oral dietary reference intake. The questionnaires indicate that among the most favourite products with vitamin D content are milk and dairy products. Less frequent but also significant are egg yolks and vegetable oils. Liver, however, was reportedly consumed by only three subjects out of 20 on a weekly basis. Based on the results, a conclusion can be drawn - vitamin D supplements play a significant role in the given age group. This claim is supported by the research results, which indicated that none of the subjects would have fulfilled the weekly oral dietary reference intake without vitamin D supplements. Currently supplementing were 8 out of 20 subjects. Seven out of the eight supplementing managed to fulfil the weekly oral dietary reference intake. These results indicate that it is necessary to increase awareness of both children and parents about vitamin D intake.
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Natural sources of lignans in our diet
NĚMEC, Petr
This bachelor thesis deals with lignans (phytoestrogens) in our diet. Preliminary of the work is focused on the characteristic of lignans, which belongs to the not entirely explored group of substances contained in various parts of the plant. The work reviews the most utilized crops (soy, flax, and cereals), from which was isolated a large amount of lignans and other compounds with estrogenic activity. Furthermore, there is introduced the list of substances contained in crops and mechanisms of their action in the human body. Their use is very beneficial in the prevention of serious diseases, so-called civilization. At the end of the work, there are highlighted various methods of separation of lignans from plants.
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