I use to not eat breakfast everyday for 18+ years. it was something I just didn't do. It wasn't until 2 years ago that I started feeling the effects: chronic fatigue, I was always feeling lethargic, etc. eating breakfast changed everything (a healthy diet really).
Check out this book about Willpower and the role of glucose. http://www.amazon.com/Willpower-Rediscovering-Greatest-Human...