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Prospective study of adults diet and their vitamin D blood level
 HAVLOVÁ, Adéla
Vitamin D is a widely discussed topic in domestic and foreign literature. Vitamin D serves many functions in human body, for example in affects calcium metabolism. Vitamin D is produced photochemically during sun exposure and partly it is consumed with food intake. This thesis is concerned with the problematic of dietary intake of vitamin D. The goal of my research was to analyze a relationship between a specific amount of vitamin D intake with food and vitamin D level in blood in a person. In this research quantitative methodology - prospective method was used. The participants of my research wrote down every meal they ate every day for nine months. They specified amount and kind of consumed food intake. Participants blood was analyzed for levels of calcidiol, alkaline phosphatase, calcaemia and phosphataemia. The blood was taken twice during the research. The number of participants involved six women and three men. The research started on 1 March 2021 and lasted until 30 November 2021. The participants from the research had no record of gastrointestinal diseases, this could affect vitamin D absorption from dietary intake and that could lead to biased results. This research was led as a blinded experiment to prevent experimental bias. It was important that the participants did not consume higher or lower amounts of vitamin D on purpose. Each participant followed regular assorted diet and did not restrict oneself in food intake. The results showed that participants of this study consumed more vitamin D in their diet on weekends rather that in a regular day. It was further discovered that in spring vitamin D blood level correlated with the amount of consumed vitamin D in diet. Median value of vitamin D intake in diet for one participant was 2,268 g per day, average value was 3,55 g per day. Based on the evaluated participants lists of meals was discovered that the amount of consumed vitamin D in diet made 17,75 % of its guideline daily amounts.
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