Usability Study of a Novel Tool: The Virtual Cafeteria in Nutrition Education.

Objective: This study aimed to evaluate the usability of the virtual cafeteria (VC) and determine its suitability for further studies in portion size education and rehabilitation of nutrition.

Methods: The study was conducted with 73 participants (aged 18-40 years). The VC, where the participants performed the task of assembling a meal, was created as a virtual reality simulation of a buffet-style cafeteria (94 food and 10 beverage items).

Lower vitamin D levels during the second trimester are associated with developing gestational diabetes mellitus: an observational cross-sectional study.

In this study, we aimed to compare serum 25(OH)D levels in women with and without gestational diabetes mellitus (GDM), and to identify the serum 25(OH)D levels associated with GDM. We recruited 40 women with GDM and 40 healthy pregnant women, aged 20-40 years and in the second trimester, at Gulhane Education and Research Hospital. We excluded women with chronic diseases, preeclampsia, pre-GDM, multiple pregnancies, and those taking medications related to calcium or vitamin D metabolism.