I serve snack at around 9:30 and lunch at 11:30 and my kids eat both really well. However, for morning snack I serve mainly fruit with some small amount of grain product such as crackers, rice cake, etc. That way they are still hungry for lunch. I serve a slightly more substantial afternoon snack, but again, it is a snack, not a meal. Also, I don't serve juice as it fills kids up without much nutritional benefit (better to eat fruit than drink juice) and adds too much sugar to their diets.