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

by Kelly McGonigal

Many factors influence your willpower reserve, from what you eat (plant-based, unprocessed foods help; junk food doesn’t) to where you live (poor air quality decreases heart rate variability—yes, L.A.’s smog may be contributing to the high percentage of movie stars in rehab).