Dietary intake of vitamin D in adults

Introduction: Vitamin D has several functions in the body. It affects calcium metabolism and various physiological functions, such as immunity, CNS, pregnancy, the cardiovascular system, etc. Its intake is mainly mediated by synthesis in the skin from 7-dehydrocholesterol thanks to UV radiation - specifically UVB with a wavelength of 290-320 nm. Another source of this vitamin is food. This article deals with vitamin D intake from food. Goal: This paper aims to map the connection between the amount of vitamin D from an adult diet and its level in the blood. Methods: To determine the level of vitamin D in the blood, we used the daily records of individual respondents according to the amount and type of food consumed for 9 months. During the research, venous blood was taken twice from the respondents to examine calcidiol, calcium, phosphatemia, and alkaline phosphatase levels. The study involved 9 respondents (6 women and 3 men) between 19-28 years, whose diets were monitored for 9 months. Results: The diet's daily intake of vitamin D corresponded to literature data, i.e., 3.55 μg. Higher intake was found on weekends and lower in the autumn months. A correlation was found between vitamin D and calcium levels. No correlation was found between vitamin D levels and alkaline phosphatase and phosphatemia. Conclusion: The results show that the intake of vitamin D from food in Czech conditions is sufficient.