Book in one sentence: The ability to unlearn and rethink is more valuable than the ability to learn and think in the first place.
- What Is Think Again About?
- The Four Thinking Modes: Which One Are You In?
- How Does Rethinking Actually Change Your Relationship With Food?
- Confident Humility: The Skill Nobody Talks About
- Is Think Again Worth Reading?
- Books Like Think Again
What Is Think Again About?
Picture a firefighter running uphill, smoke at his back, still carrying a 20-pound pack full of tools. The fire is closing fast. Safety is 200 yards away. He could drop the pack and probably survive. He doesn’t. He dies with his hand on the handle of his chainsaw.
That story comes from the Mann Gulch disaster, and Adam Grant uses it to open this book for a reason. The firefighter wasn’t stupid. He was trained. His tools were his identity. Letting them go would have meant admitting that everything he knew about his job had just become a liability, and his brain couldn’t make that leap fast enough.
Grant, a Wharton organizational psychologist and one of the most-cited researchers in his field, argues that most of us are doing the same thing with our beliefs. We haul around assumptions that stopped serving us years ago because questioning them feels like questioning ourselves. The book is about what it actually takes to let go, whether the “tools” in question are a food rule, a body story, an identity built around a particular diet, or a decades-old belief about what your metabolism can and can’t do.
The Four Thinking Modes: Which One Are You In?
Grant’s central framework describes four modes of thinking. Three of them trap us. One gets us out.
Preacher mode activates when a belief feels sacred. You stop evaluating it and start defending it. If you’ve ever explained to someone at a dinner table why their way of eating is wrong without being asked, that was preacher mode. If “I know my body” has become a sentence you say to end conversations rather than start them, same thing.
Prosecutor mode goes after other people’s reasoning. It builds a case. Diet culture runs almost entirely on prosecutor mode, whether it’s directed at strangers on the internet, at your doctor, or at the part of yourself that ate the bread last Tuesday.
Politician mode seeks approval over truth. You tell your nutritionist what she wants to hear. You tell your trainer a different version. You frame your choices based on whoever’s watching, not on what’s actually happening.
The alternative is scientist mode: treating your beliefs as hypotheses you’re testing rather than truths you’re defending. The scientist doesn’t panic when the data shifts. She finds it interesting.
“We laugh at people who still use Windows 95, yet we still cling to opinions that we formed in 1995.” — Adam Grant
Grant is careful to point out that scientist mode doesn’t mean constant uncertainty or decision paralysis. You still act. You still commit to a plan. The difference is that you hold the plan with some looseness, ready to update when better information arrives. Your next experiment doesn’t have to mean your last one was a failure. It can just mean you learned something.
How Does Rethinking Actually Change Your Relationship With Food?
The ExcessMatters relevance here is direct, and Grant doesn’t make it explicitly (the book is about business, science, and politics, not food psychology), so you have to make the translation yourself. But it’s not hard.
Consider the overconfidence cycle: a belief takes hold, you seek out confirmation (confirmation bias always delivers), your certainty deepens, and you stop noticing evidence that doesn’t fit. Anyone who has spent years in diet culture knows this loop. The certainty that comes with a new food framework feels like clarity. Keto “just works for me.” Intuitive eating “changed everything.” That certainty isn’t wrong by itself. The problem shows up when the results shift and the certainty doesn’t.
The rethinking cycle runs the other direction. Intellectual humility creates space for doubt, doubt creates curiosity, curiosity drives discovery, and discovery produces a better-grounded confidence that reveals new questions. It’s not a loop of weakness. It’s a loop of learning.
Grant also has a chapter on binary bias: the brain’s tendency to collapse complex spectrums into two categories. Nutrition runs on binaries. Good food and bad food. On plan and off plan. Clean and dirty. The actual landscape is nothing like this. A food that’s problematic for one person in one season of life can be neutral or helpful for another person at a different time. Forcing that complexity into a binary framework is where a lot of the suffering lives, not because you’re eating the wrong things but because the framework itself guarantees you’ll feel like a failure.
The practical move Grant suggests is what he calls “complexifying”: deliberately introducing nuance and conditions into how you talk to yourself about your choices. Not “I did bad today” but “that choice worked well in some ways and less well in others, and the context mattered.” This is not moral relativism. It’s just accuracy.
One more idea worth pulling out: Grant writes about escalation of commitment, the tendency to keep investing in a failing course of action because of what you’ve already spent. If you’ve been doing a particular eating approach for three years and it’s not working, there is a version of your brain that will still argue for continuing, because stopping means the three years meant nothing. Grant argues for regular “life checkups”: pausing to ask whether you would choose this path again if you were starting fresh today, with no past investment to protect. Asking that question about your food rules once a year could change a lot.
Confident Humility: The Skill Nobody Talks About
Grant draws a distinction that genuinely useful for anyone who has been through multiple rounds of dieting: the difference between confidence in yourself and confidence in your current approach.
Most of us have conflated these. When a plan doesn’t work, we take it as evidence that we don’t work. The shame spiral goes like this: commit to a plan, plan fails (or stops working), blame yourself, confidence craters, grab the next plan with desperate certainty. Repeat.
Grant calls the healthy middle ground “confident humility“: believing you are capable of figuring this out while staying genuinely open to the fact that your current method might need revision. It’s not the same as low confidence. A person with confident humility doesn’t doubt their worth or their capacity. They doubt their current knowledge, which is a much lighter thing to carry.
He supports this with research: people who combine high self-confidence with low attachment to their current beliefs outperform both the arrogant (who stop learning) and the chronically insecure (who stop acting). The scientist mindset is not about tearing yourself down. It’s about staying curious about your own experience long enough to actually learn from it.
The practical version Grant recommends is keeping a “wrong journal,” a record of times you changed your mind and what you learned in the process. For anyone who has a long history with dieting, this reframe could be genuinely healing. Instead of a list of failures, you’d have a record of a person who kept updating. That’s not a failure. That’s what learning looks like in the field.
Is Think Again Worth Reading?
Read this if you’ve been through multiple approaches to eating or your body and are starting to wonder whether the problem was never “discipline” but rather an inability to update when something stopped working. Read this if you notice yourself defending food rules more than you evaluate them. Read this if “I’ve already tried everything” has started to feel like a belief rather than a data point.
Skip it if you’re already deep in behavioral science or cognitive psychology. The framework is solid, but the territory is familiar. Grant also doesn’t apply any of this to food, health, or body image directly, so if you need that translation done for you, this book won’t do it.
One caveat: The book is engaging and well-researched, but some of the example stories are selected for narrative appeal rather than evidentiary weight. The opening smokejumper story is gripping, but the connection between wildfire decisions made in seconds under mortal pressure and the kind of deliberate rethinking Grant advocates is looser than the framing suggests. Take the case studies as illustrations, not proof.
The core framework (scientist mode, confident humility, rethinking cycle, binary bias, escalation of commitment) is genuinely useful and worth having in your vocabulary. At 320 pages, it doesn’t overstay its welcome.
Books Like Think Again
| Book | Author | Best For |
|---|---|---|
| Mindset | Carol Dweck | The foundational case for believing your abilities can grow; pairs directly with Grant’s rethinking argument |
| Decisive | Chip & Dan Heath | Practical decision-making tools for the moments when you need to act, not just rethink |
| Thinking, Fast and Slow | Daniel Kahneman | The deeper science behind why rethinking is so hard in the first place |
| Clear Thinking | Shane Parrish | Mental models for making better decisions; complements Grant’s focus on revising them |
| The Art of Thinking Clearly | Rolf Dobelli | A field guide to cognitive biases; useful as a companion reference to everything Grant describes |