Most people who struggle to change do not fail because they are lazy, weak, or unserious.
They fail because they build their change plan around the most unreliable part of the system: willpower.
This is the trap behind many of our most familiar behavior-change struggles. We tell ourselves we will eat better, exercise more, spend less, drink less, scroll less, listen more patiently, or finally start the project we keep avoiding. We make the commitment sincerely. We often even feel a surge of motivation when we make the pledge to change. In that moment, the plan feels solid because the person making the plan is calm, reflective, and future-oriented.
Then life resumes.
Stress returns. Hunger shows up. Fatigue builds. A disagreement gets under our skin. The day becomes more demanding than expected. The couch looks better than the gym. The Oreos are in your face when you open the cabinet. The online purchase feels deserved. The phone in our hand becomes easier than the book on the nightstand.
And when we slip, we often reach for the most self-punishing explanation: “I just need more willpower.”
But that statement is usually the wrong diagnosis. It assumes the failure happened because YOU were not strong enough in the moment. But very often, the real failure happened earlier, when your plan to change required too much willpower in the first place.
Willpower matters. There are moments when self-control, restraint, and deliberate effort are essential. But willpower alone is not the answer. It is a fragile foundation for lasting change. It fluctuates with context, emotion, energy, attention, and temptation. It is affected by the situation we are in and the state we are in when the decision arrives.
The better question is, “How do I build a system that does not require so much of it?”
When our behavior change plan breaks down, we tend to focus on the final moment. The moment we bought the thing, ate the dessert, skipped the workout, opened the app, or poured the second drink.
That focus makes sense. The final moment is visible. It is where the behavior happened. It is the scene we remember.
But the final moment is rarely the whole story.
A failed workout plan may begin the night before, when we stay up late and tell ourselves we will somehow feel energized in the morning. A failed eating plan may begin at the grocery store, when we bring home foods we know we struggle to resist. A failed spending plan may begin when every shopping site has our credit card saved and one-click checkout ready.
By the time the visible failure arrives, the system may have been pushing you towards that outcome for hours.
This connects directly to the idea of hot and cold states, which we have talked about on the Behavior/Shift show. George Loewenstein’s work on hot-cold empathy gaps shows that people in a “cold” state often underestimate how differently they will think, feel, and act when they are in a “hot” state — hungry, angry, tired, afraid, aroused, craving, or emotionally activated. In a cold state, our long-term goals seem clear. In a hot state, immediate needs and urges gain power. We do not simply hold the same preferences with less discipline. The whole decision environment changes from the inside.
That is why so many goals feel obvious when we make them and difficult when we need to act on them.
Cold-state you says, “I will not snack after dinner.”
Hot-state you says, “I had a brutal day, and those chips are not going to eat themselves.”
Cold-state you says, “I will be patient with my partner.”
Hot-state you says, “Actually, you are pissing me off and this would be a great time to make my point with maximum emotional force.”
Cold-state you says, “I will not spend money on things I do not need.”
Hot-state you says, “This purchase represents hope.”
The willpower fallacy is partly a failure to respect the hot state. We build plans as if our future self will be calm, rested, rational, and emotionally regulated. Then we blame ourselves when our future self turns out to be human.
The most famous scientific version of the willpower story came from research on ego depletion, especially the work of Roy Baumeister and colleagues. In their classic 1998 paper, they argued that self-control may operate like a limited resource. When people exert self-control in one task, they may have less available for a later task. The idea became influential because it matched something many people recognize from daily life: after a long day of regulating emotions, making decisions, resisting impulses, and dealing with frustration, restraint can feel harder.
This is where the popular “willpower is like a battery” metaphor came from. You begin the day with a charge. Each act of restraint drains it. By evening, the battery is low, and the snack, the purchase, the skipped workout, or the sharp comment becomes more likely.
There is value in that metaphor, but the science is more complicated than the simple version suggests.
The ego depletion literature has been challenged over the past decade. A large, preregistered replication led by Martin Hagger and colleagues found a very small effect, with confidence intervals that included zero. The researchers noted that the replication raised serious questions about the size and reliability of the classic ego-depletion effect, even though the broader question of self-control remains important.
That does not mean willpower is imaginary. It means we should avoid oversimplifying it. Self-control failures may come from several interacting forces: fatigue, motivation, attention, emotion, beliefs, habit strength, temptation intensity, and the design of the environment. Even Baumeister’s more recent work frames the theory as having evolved beyond a simple “resource exhaustion” story.
The practical lesson remains powerful: do not build your life around the assumption that you will always be able to override temptation in the moment.
Spending is one place the willpower fallacy shows up, but it is far from the only place.
It shows up with food. We decide to eat healthier and then stock the kitchen with foods that require nightly acts of resistance. We tell ourselves we will “just have a little,” even though the easiest available option is the one we are trying to reduce. Then we interpret the late-night snack as a personal failure rather than a predictable collision between availability, fatigue, and desire.
It shows up with exercise. We decide we will work out after work, even though after work is precisely when we are tired, hungry, mentally drained, and most vulnerable to negotiation. The plan depends on the most depleted version of us defeating the most comfortable version of the couch.
It shows up with technology. We tell ourselves we will stop scrolling so much, while keeping the most addictive apps on the home screen, notifications turned on, and the phone within arm’s reach during every moment of boredom. Then we wonder why our attention keeps leaking.
It shows up in relationships. We tell ourselves we will be more patient, more curious, more generous, or less reactive. But we do little to change the conditions under which our worst responses appear. We start hard conversations when we are exhausted. We respond to emotional texts immediately. We try to “be better” in the exact situations where being better is hardest.
It shows up at work. We promise to focus deeply, but leave our calendar fragmented, our notifications open, and our hardest cognitive work scheduled for the low-energy part of the day. Then we assume the problem is discipline when the design of the workday is doing half the damage.
Across all of these examples, the pattern is the same. We overestimate the power of intention and underestimate the power of context.
We think the goal should be enough. It rarely is.
One of the most useful shifts in modern self-control research is the idea that self-control does not begin at the moment of temptation. Angela Duckworth, Tamar Gendler, and James Gross describe self-control as a process that can happen much earlier. We can choose situations, modify situations, direct attention, change how we interpret temptations, or, only at the very end, rely on direct inhibition.
That last stage, direct inhibition, is the version of self-control we tend to admire most. It is the dramatic moment when you stare down the dessert, or the impulse purchase, or the cigarette, or the warm bed and instead of giving in, you say, “No.”
But that is often the least efficient place to intervene.
The quieter forms of self-control are less dramatic but more powerful.
The person trying to eat better does not keep the tempting food visible on the counter or in the pantry – actually not even having it in the house is better.
The person trying to exercise does not wait to decide at 5:30 p.m.; they put the workout clothes in the car and schedule the class ahead of time.
The person trying to improve a relationship does not rely on perfect emotional control during conflict; they create a pause rule for difficult conversations.
The person trying to stop scrolling does not simply promise to be more mindful; they charge the phone outside the bedroom.
These strategies do not look like heroic willpower. That is why we often undervalue them.
But they work because they act earlier in the process. A metaphor would be that they prevent the fire instead of celebrating the firefighter.
Kurt once spoke at a conference where a woman shared one of the clearest examples of great behavior design he had heard. She was trying to stop overspending online. She knew that when she was tired or emotionally worn down, it was too easy to make purchases she later regretted. Her willpower was not enough.
Her solution: she put her credit card in a bowl of water and placed it in the freezer.
That way, if she wanted to buy something, she had to take the frozen bowl out of the freezer and wait for the card to thaw (microwaving she mentioned would destroy the card).
This is behavior design in its most literal form.
She did not eliminate the possibility of spending. She created time between the impulse and the action. She made the hot-state decision wait long enough for the cold-state self to re-enter the room.
The frozen credit card is not about money alone. It is a metaphor for any system that creates a pause between urge and action.
If you struggle with late-night snacking, the frozen credit card equivalent might be not keeping certain foods in the house, or storing them somewhere inconvenient rather than visible and easy. If you struggle with exercise, it might be paying for a class in advance or meeting a friend so the decision is no longer entirely private. If you struggle with reactive communication, it might be a rule that difficult messages get drafted, saved, and reread before being sent. If you struggle with phone use, it might be an app blocker, a grayscale setting, or physically placing the phone in another room.
The specific tool changes but the principle stays the same.
Friction often sounds like a negative word. We usually think of friction as something that gets in the way.
But in behavior change, friction can be your friend.
A password.
A waiting period.
A calendar rule.
A commitment to another person.
A physical barrier.
A removed app.
A delayed purchase.
A phone placed outside the bedroom.
A snack that is not visible.
A conversation that cannot happen by text after 10 p.m.
Make the workout clothes easy to find.
Put the book where you will see it.
Prep the healthy food.
Schedule the check-in.
Put the journal on the pillow.
Automate the transfer.
Make the better action easier to start.
Make the distracting app harder to open.
Make the tempting food harder to reach.
Make the unnecessary purchase slower to complete.
Make the reactive message harder to send.
Make the skipped workout more socially costly.
The point is not to make life miserable. The point is to make the better behavior slightly more likely.
BJ Fogg’s behavior model is useful here. Fogg argues that behavior happens when motivation, ability, and a prompt converge. When something is easy to do and we are prompted at the right moment, even modest motivation can be enough. That is helpful when the behavior is beneficial. It is dangerous when the behavior is the thing we are trying to reduce.
Many of our unwanted behaviors are highly prompted and extremely easy. Snacks are visible. Phones are near. Shopping is one click away. Anger can be expressed instantly. Entertainment autoplays. Work notifications follow us home.
In that world, telling yourself to “try harder” is not a strategy.
It is a wish.
One of the most practical tools for reducing reliance on willpower is the pre-decision.
A pre-decision is simply a decision made before the emotional moment arrives. Instead of waiting until you are tired, hungry, tempted, angry, or lonely, you decide ahead of time how you want to respond when that state appears.
Peter Gollwitzer’s work on implementation intentions shows the power of “if-then” planning. Instead of saying, “I will do better,” you create a specific plan: “If situation X happens, then I will do Y.” These plans help connect a future cue with a chosen response, making follow-through more likely.
For eating, that might be: “If I want a snack after dinner, then I drink a glass of water and wait ten minutes before deciding.”
For exercise: “If I get home from work, then I immediately change into workout clothes before sitting down.”
For spending: “If I want to buy something nonessential after 8 p.m., then I put it on a 24-hour list.”
For relationships: “If I feel myself getting defensive, then I ask one clarifying question before responding.”
For phone use: “If I get into bed, then my phone stays charging in another room.”
These plans are not magical. They do not remove effort. But they move the decision upstream, where we are more likely to make it wisely.
The goal is not to become a person who never feels temptation.
The goal is to stop outsourcing every important decision to the version of you least equipped to make it.
A good behavior-change system begins with a more compassionate and more accurate view of human nature.
You will get tired. You will get stressed. You will have moments when immediate comfort feels more compelling than long-term benefit. You will occasionally become the version of yourself who cares deeply about the future but would also like a cookie, a couch, a purchase, a scroll, or the final word in an argument.
That does not make you weak.
It makes you normal.
The question is whether your system accounts for that normality.
Too often, behavior-change plans are built for an idealized version of ourselves. The version with plenty of sleep, emotional balance, clear priorities, and no unexpected stress. But real behavior happens under real conditions. It happens when the meeting runs late, the kids need something, dinner is not planned, the inbox is full, the body is tired, and the day has taken more from us than expected.
If the plan only works when life is smooth, it is not a plan.
It is a fantasy.
A better plan assumes friction, temptation, fatigue, and emotion will show up. It does not shame them. It designs around them.
The temptation after reading about behavior change is to overhaul everything. The diet. The budget. The schedule. The phone. The relationship. The morning routine. The evening routine. The whole self.
That is usually too much. Start with one place where willpower keeps losing.
Not your whole life. One moment.
Maybe it is the snack after dinner. Maybe it is skipping exercise after work. Maybe it is impulse spending at night. Maybe it is checking your phone before bed. Maybe it is reacting sharply when you feel criticized. Maybe it is saying yes too quickly when someone asks for your time.
What state am I usually in when this happens?
What cue or situation starts the behavior?
What makes the unwanted behavior easy?
What would create a useful pause?
What would make the better behavior easier by 10%?
That last question matters because behavior change does not always require a grand transformation. Sometimes it requires a small redesign:
Move the food.
Lay out the clothes.
Block the app.
Freeze the credit card.
Draft the message but do not send it.
Set the meeting with a friend.
Put the phone in another room.
Decide the rule before the hot state arrives.
Small changes like these can look unimpressive from the outside. But they are not small if they change the path.
The willpower fallacy tells us that change is about trying harder. Behavioral science tells us that change is often about trying differently.
It is about recognizing that behavior does not happen in a vacuum. It happens in states, situations, environments, relationships, routines, and systems. It happens under the influence of hunger, stress, fatigue, emotion, convenience, habit, and immediate reward.
So when you fail at a behavior you genuinely wanted to change, do not rush to make it a character indictment, instead, change the change design.
Ready to take your decision making to the next level? Try our Decision Shift Behavior Change Guide today. Use code SUBSTACK10 for 10% off at checkout.
A weekly reminder to rethink, reflect, and act:
Think about one place in your life where willpower keeps losing.
Not your whole life. Not every habit you want to change. One recurring moment.
What do you do when you feel tired, hungry, stressed, bored, irritated, or overwhelmed? When do your best intentions tend to disappear? What behavior becomes easiest in that moment?
Now ask yourself: Am I relying on willpower to make the right choice, or have I designed the situation to make the better choice easier?
Choose one moment to redesign this week. Do not try harder. Add one useful barrier. Remove one temptation. Create one pause. Make one better choice easier. Decide what you will do before the moment gets hot.
Then let the system do some of the work.
Willpower can be the backup. It does not have to be the plan.
Go deeper into this week’s topic:
Groove Track | Why It Takes More Than Willpower To Reach Your Goals
Curated ideas to inspire reflection:
Every week in Behavior Shift Weekly, we share ideas grounded in behavioral science and psychology, practical tools to help you think differently, act intentionally, and build the life you actually want.
Baumeister, R. F., Bratslavsky, E., Muraven, M., & Tice, D. M. (1998). Ego depletion: Is the active self a limited resource? Journal of Personality and Social Psychology, 74(5), 1252–1265.
Duckworth, A. L., Gendler, T. S., & Gross, J. J. (2016). Situational strategies for self-control. Perspectives on Psychological Science, 11(1), 35–55.
Fogg, B. J. (2009). A behavior model for persuasive design. Proceedings of the 4th International Conference on Persuasive Technology.
Gollwitzer, P. M. (1999). Implementation intentions: Strong effects of simple plans. American Psychologist, 54(7), 493–503.
Hagger, M. S., Chatzisarantis, N. L. D., Alberts, H., Anggono, C. O., Batailler, C., Birt, A. R., et al. (2016). A multilab preregistered replication of the ego-depletion effect. Perspectives on Psychological Science, 11(4), 546–573.
Loewenstein, G. (1996). Out of control: Visceral influences on behavior. Organizational Behavior and Human Decision Processes, 65(3), 272–292.
Loewenstein, G. (2005). Hot-cold empathy gaps and medical decision making. Health Psychology, 24(4S), S49–S56.
Thaler, R. H., & Benartzi, S. (2004). Save More Tomorrow: Using behavioral economics to increase employee saving. Journal of Political Economy, 112(S1), S164–S187.
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