Intervention
HOLIDAYS
For 10 weeks, each participant was given a portion of dairy product according to their groups (200 ml milk or 150 ml yogurt in a disposable plastic container). Participants were instructed to consume the products daily, as far as possible in front of the researcher in morning snack time (around 9–11 AM). For better blinding, we used two different product numbers to divide 1500 IU vitamin D fortified products from placebos.Dairy products were distributed daily with a specific code labeled on each glass for better control of receipt by the subjects. Products were delivered on the previous day for weekends and holidays to ensure daily consumption. Also participants were asked to return empty glasses on the day after the weekend.