Book excerpt: It's all too easy to run out the door in the morning without eating anything, but your first two hours of wakefulness are invaluable to your health and you are doing your body a pretty big disservice by ignoring that! Studies have shown that eating within your first two hours of waking affects the way your body regulates glucose levels in your body. If you eat a healthy breakfast, your body is on its way to processing the food and using it to keep you energized up to lunch time. When you skip breakfast, your body's glucose levels steadily decline and hunger hormones build up. You will feel grumpy and starving until you eat. And when you do eat, your body will be craving sugar and lots of it. This vicious cycle means that without breakfast, you are more likely to increase your overall calorie intake for the day and risk stunting your metabolism.