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Why do we brush our teeth without thinking, yet struggle to start exercising? In The Power of Habit, journalist Charles Duhigg explains how habits work in our brains, in companies and in society, and how they can be changed.
This summary covers the habit loop, the golden rule of habit change and an honest look at the book's strengths and limits. You will find more titles like it in our Personal Development book summaries.
Best for: readers curious about why habits form and how to change them. Reading time of the book: about a week. Reading time of this summary: about five minutes.
The book in one sentence
Habits follow a simple loop of cue, routine and reward, and you can change them by keeping the cue and the reward and replacing the routine.
About the author and the book
Charles Duhigg is an investigative reporter who has worked for The New York Times. The Power of Habit: Why We Do What We Do in Life and Business, published in 2012, mixes neuroscience, stories of people and companies, and research on behavior. It became an international bestseller.
The habit loop
| Part | What it is | Example |
|---|---|---|
| Cue | A trigger that starts the habit | Feeling stressed at 3 p.m. |
| Routine | The behavior itself | Walking to the vending machine |
| Reward | The benefit that makes the brain remember it | A break and a sweet taste |
Over time, the brain links cue and reward so strongly that a craving appears, and the behavior becomes automatic.
Key ideas worth remembering
1. Habits save mental effort
The brain turns repeated actions into routines to save energy. This is useful, but it also means bad habits can run on autopilot.
2. The golden rule of habit change
You cannot simply delete a habit. Keep the same cue and reward, and change the routine. If a snack at 3 p.m. is really about a social break, a chat with a colleague can fill the same need.
3. Cravings drive habits
A habit becomes strong when you crave the reward as soon as you see the cue. Duhigg gives examples such as brushing teeth, where a minty tingle creates the feeling that makes the habit stick.
4. Keystone habits
Some habits, such as exercise or family meals, start a chain reaction and improve other parts of life. Focusing on one keystone habit can create small wins that build momentum.
5. Belief and willpower
Duhigg says habits last when we believe change is possible, often with the support of a group. He also describes willpower as a muscle that can tire, so it helps to build routines that need less of it.
Strengths and limits
What works well
- Engaging stories that make the science easy to follow.
- A simple, memorable framework: cue, routine, reward.
- Practical advice on how to analyze and change a habit.
Where it falls short
- The business and social examples are long and sometimes drift from the main idea.
- Some science, such as willpower as a limited resource, has been questioned by later research.
- The book gives fewer step-by-step routines than some other habit books.
Who should read it?
Who should read it: readers who like stories and science, and anyone starting to study habits. Who may skip it: readers who want a short, tactical how-to.
Key takeaways
- Every habit has a cue, a routine and a reward.
- Keep the cue and reward, change the routine.
- Cravings make habits stick.
- Keystone habits trigger positive chain reactions.
- Belief and community help change last.
FAQ
What is The Power of Habit about?
It explains how habits form through a loop of cue, routine and reward, and how individuals and organizations can change them.
What is a keystone habit?
It is a habit that sets off positive changes in other areas of life, such as regular exercise.
How is The Power of Habit different from Atomic Habits?
Duhigg focuses on the science and stories behind habits, while Atomic Habits offers a more practical system for building them.
Is The Power of Habit worth reading?
Yes, for the clear framework and the stories. Read it with a critical eye for some of the science.
Keep reading
- Atomic Habits by James Clear: Summary, Key Ideas & Review: a practical system built on the same idea.
- Deep Work by Cal Newport: Summary, Key Ideas & Review: turn focus into a habit.
- Flow by Mihaly Csikszentmihalyi: Summary, Key Ideas & Review: a guide to deep focus and absorbing, meaningful work.
- All Personal Development summaries
- Back to the SummarBooks home page
Ready to change a habit?
Pick one habit you want to change and write down its cue, routine and reward for a week. If you want the full stories and research, get a copy of The Power of Habit on Amazon.
Disclosure: as an Amazon Associate, SummarBooks earns from qualifying purchases. If you buy through the links above, we may earn a small commission at no extra cost to you. This summary is an independent overview and does not replace reading the book.