How to Build Willpower? Disciplined People Resist Less

On Sunday night you decide this week will be different: up early, phone away an hour before bed, no more eating after dinner. By Wednesday evening you are on the sofa with the screen in your hand and a box of sweets within arm's reach. You tell yourself, "My problem is weak willpower."

So you search for it: how to build willpower. You expect a list of exercises for a weak muscle somewhere inside you.

But what researchers have found unsettles that picture. In a study that followed the daily lives of 205 people, those high in self-control did not resist temptation more than everyone else. They fought fewer battles. And the idea that willpower is a tank that drains with use did not hold up as it was once told when it was tested again in dozens of labs. So perhaps the question needs changing. Instead of "How do I strengthen my willpower?", ask "How do I reduce what needs willpower in the first place?"

"Willpower is a muscle": the idea that ruled for decades

In 1998 the psychologist Roy Baumeister and his colleagues published experiments that caught the field's attention. Participants sat in front of tempting chocolates but were asked to eat radishes instead, then were handed a puzzle that could not be solved. Those who had forced themselves through the radishes gave up sooner than people who had not had to hold back around food. The researchers concluded that choice, self-control and other acts of will may draw on one shared, limited inner resource, and they called the effect "ego depletion".

In 2011 Baumeister carried the idea to general readers with the journalist John Tierney in the book Willpower. The comparison caught on: willpower is a muscle, tired by use and strengthened by training. It feels right because it matches the end of the day. You hold out until mid-afternoon, then give way at dinner.

What happened when other labs tried again?

In 2016 a study with a preregistered plan was published. Twenty-three labs ran the same procedure on 2,141 participants. The estimated effect was just 0.04, and its confidence interval included zero (the upper bound was 0.15). In plain terms, the effect was too small to tell apart from nothing.

Supporters of the theory did not stay quiet. Baumeister and his colleague Kathleen Vohs objected that the protocol differed from the 1998 experiments and that its tiring task may not have been demanding enough, and other researchers also questioned whether that task worked. In 2021 Vohs and colleagues published another test, across 36 sites with 3,531 participants. They reported that the preregistered analyses found no evidence of a depletion effect (size 0.06), and that an exploratory analysis of the full sample, with no one excluded, found 0.08, a tiny effect.

What does this mean for you? It does not mean tiredness is imaginary or that effort costs nothing. It means the popular picture, one tank that drains like a battery, lost its footing in two large preregistered tests, and that researchers still disagree about how big the effect is and when it appears. So do not build your life plan on a battery that may not exist.

They don't resist more, they resist less: the seven-beep study

One study is worth knowing because it was run in ordinary life, not in a lab. Wilhelm Hofmann, Baumeister and two colleagues published it in 2012. A total of 205 adults in Germany carried a small device for a full week. It beeped seven times a day at irregular times. At each beep, participants answered: Do you want something right now, or did you a moment ago? Does it clash with a goal of yours? Did you try to resist? What happened? The researchers collected 7,827 reports of desires.

They found that desires were frequent (people felt one at about half of the beeps), varied in strength, and mostly caused no trouble. When a desire clashed with another goal, people tended to resist it, with uneven success. And people who scored high on a trait self-control scale reported desires as often as everyone else, but they felt less inner conflict and tried to resist less often.

So what is their secret? The British Psychological Society's summary of the study reads it this way: these people are not superhuman, they steer clear of situations that expose them to troublesome temptations. Hofmann himself comes close to that view; he told Chicago Booth Review in 2013, in effect, that you only need resistance once you have started sliding down a slippery slope. But that is an interpretation of the result, not a result in itself. Their lives are not free of desire; they are lives where desire collides with goals less often.

None of this makes resisting worthless. According to the British Psychological Society's summary of the study, 70% of desires were acted on when people did not resist, and that fell to 17% when they did. Resistance works. But if you rely on it in every battle, you will fight more battles than someone who arranged their day so the battle never started.

This is a correlational study: nobody was asked to change anything so the researchers could see what happened. In fairness, a second paper from the same data found something that fits the limited-resource idea: the more often people had used self-control earlier in the day, and the more recently, the less likely they were to succeed in resisting later desires that day. That, too, is an observation rather than an experiment, so it settles nothing about cause. And if every act of resisting does carry a cost, the practical rule is the same either way: fight fewer battles.

A good habit looks like strong willpower from the outside

You watch a colleague walk every morning and assume he is made of different stuff. But you see the result, not the inside. He may not be negotiating with himself at all, because walking has simply become what happens after coffee.

This is what Brian Galla and Angela Duckworth investigated in six studies with 2,274 people. The question: why is self-control linked to good life outcomes? Is it harder effort at holding back, or something else? They found that habits supporting a goal stand behind part of that link. In the first study, people with higher self-control were more automatic about eating healthy snacks, exercising and sleeping regularly, and spent less effort holding themselves back; their habits were the bridge. In the last study, study habits accounted for part of the link between self-control and homework completion, grade point average, and whether students persisted in college through their first year.

The authors concluded that habits, more than strained restraint, may be what connects self-control to good outcomes. The statistical mediation analysis supports that reading but does not prove it.

It echoes what Wendy Wood and colleagues found in two diary studies published in 2002: when people do something out of habit, meaning nearly daily in a stable setting, their minds often drift to something else while they do it. The researchers suggest this is because the action does not need conscious steering. People also reported less stress during habitual actions than during non-habitual ones.

Does training willpower itself help?

A little, perhaps. In 2017 Friese and colleagues analysed 33 studies (158 effect sizes) testing self-control training. The average effect was 0.30, between small and medium. But they found signs of publication bias or small-study effects, and when they corrected for them the estimates dropped to between 0.13 and 0.24. They added that why training works at all is still poorly understood.

So there is no harm in training yourself at something you enjoy, but do not hang your whole plan on a small and uneven effect. What those studies hint at is a different direction: cut the number of battles before you strengthen the fighter.

Cancel the fight before it starts: your surroundings first

If people high in self-control fight fewer battles, the practical route is to lower the number of your own. The closest evidence we have on this concerns food specifically.

A 2019 Cochrane systematic review looked at 24 randomised trials of changing how available or how near food is. Moving food farther out of reach reduced how much people ate, with a medium-sized effect. But the reviewers rated the certainty as low: every trial was about food, 14 were run in a lab, and 20 had concerns about possible bias. So treat the idea as an experiment to run on your phone and your workday, not as settled fact.

Before you put your willpower on trial: how did you sleep?

After a day when your plan fell apart, check your sleep before you judge yourself weak.

A systematic review and meta-analysis published in 2021 pooled 61 studies. In it, both sleep quality and sleep duration were linked to self-control, whether comparing different people or following the same person over time. Sleep quality showed the clearer link, more than the number of hours. And in a 2017 meta-analysis of experiments that restricted participants' sleep, mental performance weakened overall, including executive function, by a small-to-medium amount. But that analysis found insufficient evidence of an effect on impulsive decision-making specifically, so do not blame poor sleep for more than it can carry.

The first review cannot settle cause and effect, and its authors called for deeper research into the causal process linking sleep and self-control. But the practical point does not need to wait: treat sleep as part of designing your surroundings, not a reward after you hit your goals. And if your phone is stealing your sleep, it belongs at the top of your battle inventory.

This idea is the heart of chapter two, "Willpower Is Not the Hero of This Story", in the book "Resigning from Yourself". The chapter builds it through scenes from daily life and adds a tool, "A Steady Anchor", that ties a small action to a moment that already repeats in your day.

If you lead a team, ask the same question about their working environment: what would make the right action easier for them, before you ask why they don't follow through? There is another side to leadership in the Arabic book "Al-Modeer Al-A'ma" (The Blind Manager).

Tonight, pick one of your battles and move it from the moment of temptation to a calm moment. In a week, notice how many times you needed to resist.