I'm sorry to hear that your snacks were taken. It's understandable to feel frustrated when something like that happens.
While it's disappointing that the children took your snacks, it might be helpful to consider what Ellen White says about appetite and taste. She wrote quite a bit about the importance of a healthy diet and how our tastes can be educated to prefer simple, wholesome foods. I can look up some of her writings on this topic if you're interested. Would you like me to search for what she says about developing a healthy appetite?