Eat breakfast. This may seem like the oldest piece of nutrition advice, but it's also one of the hardest to follow. Skipping this meal really does make it hard to keep energy levels high during a full day of teaching. Breakfast should consist of carbs, protein and fiber. Traditional oatmeal (there's not much fiber in instant), yogurt and an orange (juice has little fiber) would be a healthy option. If you're not hungry in the morning, eat dinner earlier the night before, and if you wake up ravenous, you probably didn't get enough sleep. “Less than six hours of sleep a night makes your body release hormones that make you hungrier in the morning," says Linda Hamilton, a clinical psychologist who works with performers, and co-author of The Dancer's Way: The New York City Ballet Guide to Mind, Body and Nutrition.