The king gave the young men a certain amount of food and wine every day, just like the food he ate. The young men were to be trained for three years, and then they would become servants of the king of Babylon.
Daniel decided not to eat the king’s food or drink his wine because that would make him unclean. So he asked Ashpenaz for permission not to make himself unclean in this way.
You were taught to leave your old self—to stop living the evil way you lived before. That old self becomes worse, because people are fooled by the evil things they want to do.