Objective: Vitamin D is known to have important effects on human health. The existence of a relationship between obesity and vitamin D levels, which have been shown to cause a number of health problems with various studies, is certain. In this study, the relationship between vitamin D levels and body mass indexes(BMI) of individuals was evaluated. The study is unique for being the only research on literature that carried out with university employees. Materials and methods: Blood samples, anthropometric measurement (BMI) was obtained from 87 volunteer working at Haliç University. The questionnaire form covering the basic questions applied by means of face-to-face method. Quantification of the analytes for 25-hydroxyvitamin-D was carried out using LC-MS/MS. The relationship between 25-hydroxyvitamin-D values and BMI was evaluated with Tukey HSD multiple comparison test. 95% confidence and 80% power sampling were applied to the predictions of a minimum0.50 connection coefficient between 2 quantitative variables.The necessity of 30 cases was determined by using the N = [(Zα+Zβ)/C]2 + 3formula.Considering the losses, the work will be carried out over 80 people. Results and Discussion: There’s significant difference between 25-hydroxyvitamin-D2 and 25-hydroxyvitamin-D3 and the BMI levels of the subjects(p:0.028<0.05-p:0.000<0.05). The average 25-hydroxyvitamin-D3 and 25-hydroxyvitamin-D2 levels of overweight participants were significantly higher than the mean levels of underweight participants’. No significant relationship was found between 25-hydroxyvitamin-D3 and 25-hydroxyvitamin-D2 levels and the time spent outdoors during summer and winter. Conclusion: To prevent vitamin D deficiency and insufficiency is to obtain some sensible sun exposure, ingest foods that contain vitamin D, and take supplement. Bangladesh Journal of Medical Science Vol.19(2) 2020 p.229-236

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COVID-19 is a disease that spreads rapidly by being transmitted from person to person by droplet infection and is defined as a pandemic by the World Health Organization. Social isolation, compliance with hygiene rules, adequate and balanced nutrition are of great importance in this period. Our study aimed to investigate the impact of the COVID-19 epidemic on the stress experienced by Haliç University students and their eating habits and lifestyle changes. Data collection was carried out through a structured questionnaire created in Google Forms (online). In addition, the stress level was determined using the "Perceived Stress Scale". Change in physical activity level, change in dietary habits, and change in desire to eat out were significantly correlated with perceived stress level (p=0.007; p=0.02; p=0.003, respectively). But it was not found to be associated with BMI (p=0.02). During quarantine, we must encourage healthy eating and physical activity at home. The number of studies examining the adaptation of university students, who have an important role in the development of society both in the world and in our country, to epidemic conditions is limited. Therefore, this study will contribute to the literature.