Lasting change comes less from motivation than from routine. The research on habits, goals and learning points to the same few principles: repeat a small action in the same situation, decide in advance when and where you will do it, practise in ways that make you recall rather than reread, and keep people around you. This guide covers what the evidence says on each, and where popular advice runs ahead of it.
How long does it take to form a habit?
Longer than the popular 21 days. In a 2010 study, 96 volunteers repeated a new daily eating, drinking or activity behavior in the same context, such as after breakfast. The time it took for the behavior to feel automatic ranged from 18 to 254 days, with a median of 66 days.
Two findings from that study are worth holding on to. Habits formed through repetition in a consistent situation, which is why tying a new behavior to an existing routine works. And missing one opportunity did not materially affect the process, so a missed day is a reason to carry on rather than restart. Our article on how habits form goes deeper.
What makes a goal more likely to happen?
A specific plan for when, where and how you will act. Psychologists call these implementation intentions, in the form "If situation Y is encountered, then I will initiate goal-directed behavior X!" A 2006 meta-analysis of "94 independent tests" found they had "a positive effect of medium-to-large magnitude (d= .65) on goal attainment", over and above simply having the goal.
| Vague goal | If-then plan |
|---|---|
| "Exercise more" | "After I finish lunch, I will walk for 10 minutes." |
| "Read more" | "After I get into bed, I will read 2 pages." |
| "Call family more" | "After Sunday lunch, I will call my sister." |
The if-then habit planner helps you write one, including a backup for the obstacle most likely to stop you.
Why does motivation fade, and what keeps you going?
Motivation is high at the start and drops before a behavior becomes automatic, which with a median of 66 days takes a while. Self-determination theory, set out in a 2000 paper in American Psychologist, names three needs that support lasting motivation: competence, autonomy and relatedness, "which when satisfied yield enhanced self-motivation and mental health." In practice: start at a level you can manage, choose goals for your own reasons, and involve other people. Our article on how motivation works covers dopamine, effort and getting started.
What is the most effective way to learn something new?
Test yourself, and spread practice out. A 2013 review rated ten common study techniques and found that "Practice testing and distributed practice received high utility assessments", while rereading and highlighting, the most popular, "do not consistently boost students' performance."
- Recall instead of rereading: close the book and write down what you remember, then check.
- Space your sessions: several short sessions over days beat one long one.
- Protect sleep: short sleep affects attention more than any other thinking skill; see how to improve focus.
Read more in how to learn effectively.
Does a growth mindset make a difference?
Less than its popularity suggests. Two 2018 meta-analyses found that "Overall effects were weak" for mindset and achievement, though students from poorer backgrounds or at academic risk may benefit more. Believing you can improve is reasonable; what actually moves results is how you practise. See does a growth mindset really work.
Why do relationships matter so much?
Because they are among the strongest everyday predictors of long-term health. A 2010 review of 148 studies found "a 50% increased likelihood of survival for participants with stronger social relationships", an influence the authors called "comparable with well-established risk factors for mortality." The studies were observational, so they show a link rather than proof. Regular contact is itself a habit worth planning; see why social connection matters for your health.
How do you put it all together?
- Pick one habit, not five, and make it small enough for a bad day.
- Anchor it to something you already do daily.
- Write an if-then plan with a backup for the likely obstacle.
- Expect about two months before it feels automatic, and carry on after a missed day.
- Involve someone, for company, accountability or both.
When is it more than a habit problem?
If you cannot get started on anything for weeks, have lost interest in things you used to enjoy, or feel low most days, talk to a doctor: those can be signs of depression rather than a lack of discipline. The same applies if a habit you are trying to break, such as drinking, feels out of your control.
