Anne Bogel opens by identifying decision fatigue — the depleting mental cost of making many decisions, especially minor ones, throughout the day — as a genuine, well-documented phenomenon that can be actively managed rather than simply endured.

Why understanding decision fatigue matters:

• Many people attribute their late-day poor decisions or exhaustion to personal weakness, when decision fatigue is actually a well-documented, universal cognitive pattern
• Recognizing this pattern allows deliberate strategies to reduce unnecessary decision-making, preserving mental energy for decisions that genuinely require it
• This reframe removes unwarranted self-judgment about struggling with excessive daily decision-making

This opening establishes the book's practical framework: reducing unnecessary decisions to preserve mental energy for what genuinely matters.