Old habits run on cues rather than willpower, and you can rewire them

Key takeaways

• When 115 students moved to a new university, strong habits such as exercise mostly carried over only when the setting stayed the same.
• The popular idea that willpower drains like a battery failed two large tests, run in 23 labs in 2016 and 36 labs in 2021.
• A 2025 meta-analysis of 642 tests found that simple if-then plans helped people manage their thoughts, feelings and actions, and the plans worked better when people rehearsed them.
• Saving a treat for the gym raised workouts in two field studies, though the first boost faded and the second was modest, and calling a start date a “fresh start” raised retirement-savings sign-ups in one large experiment.
• In 2022, about half of U.S. adults who smoked tried to quit, but fewer than 1 in 10 quit successfully that year, so plan your comeback from a slip before you need it.

In the spring of 2002, 115 college students packed up and transferred to Texas A&M University. A team led by psychologist Wendy Wood had asked them about three daily routines about a month before the move: exercising, reading the newspaper and watching TV¹.

About a month after the move, the researchers checked again. The students’ strongest habits did not all survive the trip. They held up mainly when key parts of the setting stayed the same, such as working out in the same kind of place¹.

When the setting changed, a door opened. In some cases, what students did began to follow what they meant to do, instead of what they had always done¹.

That study points to the most useful idea for changing a habit you’ve had for 20 or 30 years. A long-held habit isn’t proof of weak character. It is a groove worn into a certain time, place and set of people.

If you’ve tried for years to drop the evening snack, the afternoon soda or the late-night scroll, you may have blamed your willpower. Research says that’s the wrong target. This article covers what the evidence supports, how strong each piece is, and a plan you can start this week.

Old habits live in your surroundings, not your resolve

Psychologists define a habit as an action that a cue sets off with little thought. It forms through repetition in a stable setting¹. The cue can be a place, a time of day, a person, a mood or the action that comes just before.

Wood’s team pointed to a diary study in which 47% of people’s daily activities happened almost every day, usually in the same place¹.

The transfer study showed what that means. Among students with strong habits whose setting didn’t change, their plans and intentions didn’t predict what they did. They simply kept doing it¹.

Weak habits looked different. They tended to follow people’s intentions whether or not the setting changed¹.

The study had limits. It tracked people rather than assigning them to move, so the authors said experiments were needed to prove cause and effect¹.

Still, the lesson is practical. With a decades-old habit, the cue is your handle. Most old habits have several cues bundled together: the same chair, the same hour, the same show, the same tired feeling.

How long does a new routine take to stick? A 2024 review of 20 studies highlighted a well-known study by Phillippa Lally’s team: the middle value was 66 days, but people ranged from 18 to 254 days¹⁵. Our article on behavioral medicine covers that research in more depth.

The “willpower is a muscle” idea failed its biggest tests

For years, a popular theory called ego depletion said self-control draws on a limited supply that runs down as you use it. In this view, resisting doughnuts at the office leaves you less able to resist chips at night.

In 2016, 23 labs ran the same ego-depletion experiment with 2,141 people². The study was preregistered, meaning the researchers published their plan before collecting data so they couldn’t change it afterward.

The effect was close to zero. Researchers measure the size of an effect with a number called d, where zero means no difference at all. This study found a d of 0.04, and the range of likely values included zero².

In 2021, a second team tried again with 36 labs and 3,531 people, using two different methods³. The planned analysis again found no clear effect, with a d of 0.06. The data were about four times more likely if there were no depletion effect than if there were one³.

One detail is worth keeping. In extra analyses the team had not planned in advance, the effect was larger among people who said they felt more tired³. Fatigue may matter. But “I used up my willpower” isn’t a good explanation for why an old habit wins.

A better explanation comes from the habit research. The cue showed up, and the habit ran¹. So instead of planning more battles with yourself, change the setup.

If-then plans hand an old cue a new script

An if-then plan, which researchers call an implementation intention, links a specific situation to a specific response. It reads like this: “If [situation], then I will [action].”

Psychologists Peter Gollwitzer and Paschal Sheeran have studied these plans for decades. In 2025, Sheeran, Gollwitzer and Olivia Listrom pooled 642 separate tests in a meta-analysis, a study that combines the results of many earlier studies, in the European Review of Social Psychology⁴. If-then plans helped people manage their thoughts, feelings and actions⁴. The effects ranged from a d of 0.27 to 0.66, small to medium by standard yardsticks⁴.

The plans worked better under three conditions. People used a true if-then format, they cared a lot about the goal, and they rehearsed the plan⁴. A few studies in the 2024 habit review also linked specific plans about when and where to act with building a routine¹⁵.

If-then plans suit old habits for a simple reason. The old habit already has a reliable cue. You keep the cue and swap the response.

• “If I sit down in my recliner after dinner, then I’ll pour a mug of herbal tea before I turn on the TV.”
• “If I feel the 3 p.m. slump at my desk, then I’ll walk outside for five minutes.”
• “If I plug in my phone at night, then I’ll set it in the kitchen, not by the bed.”

Say your plan out loud a few times, or write it on a card you’ll see at the moment it matters.

Add friction to the old habit and pleasure to the new one

Small barriers change behavior more than most people expect. In 2019, Cochrane, an international group known for careful reviews, pooled 24 randomized trials that changed how close food was or how many choices people had⁵. In a randomized trial, people are assigned by chance to one group or another.

When food was placed farther away, people ate a moderate amount less, across 12 studies with 1,098 people⁵. Offering fewer options also cut how often people picked the targeted foods⁵.

The reviewers rated the certainty as low. Fourteen of the 24 trials took place in labs, 20 raised concerns about bias, and the authors called for longer studies in real-world settings⁵. Still, moving a food is cheap and safe to try.

Friction works in reverse, too. In one study from the 2024 habit review, a preparation routine, such as laying out exercise clothes, was tied to who built an exercise habit¹⁵. Make the old habit a little harder and the new one a little easier.

The second tool is temptation bundling: letting yourself enjoy something only while doing a task you tend to avoid. In a 2014 University of Pennsylvania study, people could listen to gripping audiobooks only at the gym⁶. At first, they went to the gym 51% more often than a comparison group. People who were simply encouraged to save audiobooks for the gym went 29% more often⁶.

The effects faded over time, especially after the Thanksgiving break⁶. Even so, 61% of participants paid afterward for gym-only access to audiobooks⁶.

A larger follow-up in 2020 included 6,792 members of the 24 Hour Fitness chain⁷. A free audiobook plus advice to bundle raised the chance of a gym visit in a given week by roughly 10% to 14%, during the four-week program and up to 17 weeks later⁷. The advice itself added only a modest edge over the free audiobook alone⁷.

There are limits. That comparison wasn’t preregistered, and in a companion study in the same paper only about 14% of people downloaded their audiobook⁷. Treat bundling as a helpful extra, not a cure.

A fresh start opens a window, so use it soon

Researchers at the Wharton School found that people reach for goals at “temporal landmarks,” such as a new week, month or year⁸. U.S. Google searches for “diet” ran 82.1% above normal at the start of a year and 14.4% above normal at the start of a week⁸.

At one university gym, visits rose 33.4% at the start of a week and 47.1% at the start of a semester⁸. Those were patterns in existing data, not an experiment, and they came from one campus⁸.

Later, an experiment tested the idea. More than 6,000 university employees got mailings inviting them to start saving in a retirement plan⁹.

Some letters offered a later start tied to a fresh start, such as a birthday or the first day of spring. Others named a plain date, such as two months away. Enrollment for the later date ran 50% higher in the fresh-start group, and sign-ups to start right away didn’t drop⁹.

That experiment, like the larger temptation-bundling study, came from the same circle of researchers as the original idea⁷⁹. Tests by independent teams would add confidence.

There’s also a catch. A separate study co-written by Hengchen Dai, one of the fresh-start researchers, found that people already working on a goal tended to ease off when a fresh start was coming⁹. So don’t postpone a habit change you’ve already begun.

Big life changes can work as fresh starts, too. A move, a new job or retirement can scramble old cues, much as the move to a new campus did for the transfer students¹. Those moments are a good time to set up the new routine you want, before the old one finds its way back.

Plan for slips before they happen

Long-held habits rarely end on the first try.

In 2022, 67.7% of U.S. adults who smoked said they wanted to quit, and 53.3% had tried in the past year, according to the CDC¹². Only 8.8% had quit successfully in that year¹². The CDC notes that quitting often takes several attempts¹².

A slip is a normal part of the record, not the end of it. In a 2021 study of 54 programs to boost gym visits, the best performer gave small rewards to people who came back after a missed workout¹⁰. It rewarded the comeback, not a perfect streak.

How you treat yourself after a slip may matter, too. A 2015 analysis of 15 groups totaling 3,252 people linked self-compassion with healthier eating, exercise, sleep and stress habits¹¹. The link was small, and these studies show an association, not proof of cause¹¹. Part of the link ran through mood: more self-compassionate people reported more good feelings and fewer bad ones¹¹.

Try a short script after a slip: “That’s information, not a verdict. What was the cue? What’s my next if-then?”

A step-by-step plan for a 20-year habit

This plan combines the tools that held up best. To show how it works, picture a hypothetical reader we’ll call Dana, who has eaten a bag of chips in front of the evening news for 25 years.

Step	What you do	Dana’s version
1. Map the cues	For one week, note where, when, with whom and in what mood the habit happens	Recliner, 6 p.m. news, alone, tired after work
2. Pick a swap	Choose a new action that fits the same cue and feels good	A bowl of air-popped popcorn or cut raw vegetables
3. Write the if-then	Link the cue to the new action, then rehearse it	“If I sit down for the news, then I’ll bring my bowl from the kitchen first.”
4. Add friction	Make the old habit harder to reach	Stops buying chips; keeps any in the garage
5. Remove friction	Make the new habit easy	Washes and cuts vegetables on Sunday
6. Bundle a treat	Save something enjoyable for the new routine	Favorite podcast only during an after-dinner walk
7. Pick a start date	Use a meaningful date within two weeks, not months away	The first of next month
8. Plan the comeback	Decide in advance what you’ll do after a slip	Small reward for getting back on track the next night
9. Track and wait	Mark progress on a calendar for at least two months	Checks in at day 6615

Two rules make this work. Change one habit at a time, and judge yourself on how quickly you return, not on whether you ever slip.

What the evidence shows

Approach	What studies found	Evidence level
If-then plans	642 tests; small to medium effects, larger with rehearsal4	Strong evidence
Changing your setting to break a habit	Strong habits carried over mainly when the setting stayed the same1	Promising but early
Moving tempting food farther away	People ate moderately less; mostly lab trials, low certainty5	Promising but early
Temptation bundling	51% more gym visits at first, fading; a 10% to 14% lift in a larger follow-up67	Promising but early
Fresh-start dates	Strong patterns in data; one large field experiment on savings89	Promising but early
Self-compassion after slips	Small link with healthier habits; not yet shown to cause them11	Promising but early
Willpower as a fuel that runs out	No clear effect in two large preregistered tests23	Evidence says no

Rhythm and place are old wisdom

Many traditions built health into rhythm and place long before anyone measured habits. Morning walks, a set mealtime, a tea ritual at dusk, a day of rest each week: these tie good actions to reliable cues.

The research points the same way. Lasting change comes less from forcing yourself and more from arranging your days so the healthy choice is the easy, familiar one¹⁵. That fits a natural-health instinct to work with the body’s patterns instead of against them.

It also offers some grace. If a habit has outlasted many New Year’s resolutions, that isn’t a moral failure. It’s a sign the cues are strong, and cues can be changed.

Questions readers ask

The bottom line

A habit you’ve had for decades runs on cues: the time, the place, the people and the mood that have always come with it. The old idea that willpower drains like a battery didn’t hold up in large tests, so blaming yourself misses the point.

What works better is practical and kind. Change the cues, write an if-then plan, make the old habit harder and the new one more enjoyable, start soon, and decide now how you’ll come back from a slip.

Related reading

• Behavior science tested its own tricks at scale, and rewards and repetition held up
• Taking charge of your health helps, until it turns into blame
• Pressure makes loved ones hide their habits, and other kinds of help work better
• Wellness apps help a little if you keep using them, and most people don’t
• Walking clubs work, and you need fewer steps than you were told

Sources

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3. Vohs KD, Schmeichel BJ, Lohmann S, Gronau QF, et al. “A Multisite Preregistered Paradigmatic Test of the Ego-Depletion Effect.” Psychological Science, 2021. pubmed.ncbi.nlm.nih.gov
4. Sheeran P, Listrom O, Gollwitzer PM. “The when and how of planning: Meta-analysis of the scope and components of implementation intentions in 642 tests.” European Review of Social Psychology, 2025. kops.uni-konstanz.de
5. Hollands GJ, Carter P, Anwer S, et al. “Altering the availability or proximity of food, alcohol, and tobacco products to change their selection and consumption.” Cochrane Database of Systematic Reviews, 2019. cochrane.org
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7. Kirgios EL, Mandel GH, Park Y, Milkman KL, Gromet DM, Kay JS, Duckworth AL. “Teaching temptation bundling to boost exercise: A field experiment.” Organizational Behavior and Human Decision Processes, 2020. faculty.wharton.upenn.edu
8. Dai H, Milkman KL, Riis J. “The Fresh Start Effect: Temporal Landmarks Motivate Aspirational Behavior.” Management Science, 2014. faculty.wharton.upenn.edu
9. UCLA Anderson Review. “Fresh-Start Framing Boosts Retirement Plan Participation” (on Beshears J, Dai H, Milkman KL, Benartzi S, Organizational Behavior and Human Decision Processes, 2021). UCLA Anderson School of Management, 2021. anderson-review.ucla.edu
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11. Sirois FM, Kitner R, Hirsch JK. “Self-compassion, affect, and health-promoting behaviors.” Health Psychology, 2015. eprints.whiterose.ac.uk
12. Centers for Disease Control and Prevention. “Smoking Cessation: Fast Facts.” CDC, updated September 17, 2024. cdc.gov
13. Centers for Disease Control and Prevention. “Five Reasons Why Calling a Quitline Can Be Key to Your Success.” CDC Tips From Former Smokers, updated November 12, 2024. cdc.gov
14. Substance Abuse and Mental Health Services Administration. “SAMHSA’s National Helpline.” SAMHSA, accessed October 2026. samhsa.gov
15. Singh B, Murphy A, Maher C, Smith AE. “Time to Form a Habit: A Systematic Review and Meta-Analysis of Health Behaviour Habit Formation and Its Determinants.” Healthcare, 2024. pubmed.ncbi.nlm.nih.gov