Breakfast - Right after you wake up and get dressed Lunch - 11 or 12. Dinner - 4 to 7 Note: Do not brush before a meal, or you would have wasted toothpaste and 2 minutes!
When you're hungry. If you need to follow a schedule, eat more if you're hungry and less when you aren't. Simple, isn't it. Btw, don't eat within 2 hours of bedtime.