The Willpower Instinct: How Self-Control Works, Why It Matters, and What You Can Do To Get More of It

by Kelly McGonigal

Or he would use whatever he ate at breakfast to determine whether this would be a “good day” or a “bad day”—if he ate a bacon-and-egg sandwich for breakfast, it was going to be a bad day, which meant he was free to eat meat at lunch and dinner, too. Tomorrow (he told himself) would be a good day from start to finish.