Habits are an integral part of our daily lives, shaping our routines and influencing our overall well-being. From the mundane act of brushing our teeth to more complex behaviours like smoking or procrastination, habits can be both beneficial and detrimental. While conventional wisdom has long suggested that it takes precisely 21 days to change a habit, research suggests otherwise. Research has demonstrated that, on average, it takes approximately 66 days for a behaviour to become automatic (Lally et al, 2010). This research, which tracked participants forming new habits, discovered that the actual timeline varies considerably, ranging from 18 to 254 days, depending on the behaviour’s complexity and individual factors.
The variation in habit formation timelines reflects the deeply personal nature of behavioural change. Simpler habits, such as drinking water upon waking, typically require less time to establish than more complex behaviours like maintaining a regular exercise routine or overcoming addictive behaviours. This understanding challenges the notion of a universal timeline and emphasises the importance of patience and persistence in the habit-changing process.
The formation of habits
At the core of habit formation lies a neurological pattern that consists of three key components: cue, routine, and reward. The cue acts as a trigger that prompts the brain to enter automatic mode, initiating the routine – the behaviour itself. Finally, the reward reinforces the habit loop, helping the brain determine whether the behaviour is worth remembering. For instance, receiving a notification on your phone serves as a cue to check social media, the routine is the act of scrolling through your feed, and the reward is the satisfaction of engaging with friends or content.
This habit loop is not merely a theoretical construct; it is grounded in the biology of our brains. Research indicates that habits arise through repetition, allowing behaviours to become automatic and freeing up cognitive resources for other tasks. However, this automaticity can also lead to the establishment of harmful habits, such as overeating or substance abuse, which are often reinforced by the brain’s reward systems. The release of dopamine during pleasurable activities strengthens these habits, making them more challenging to break.
Understanding this loop is essential for both establishing new habits and breaking existing ones. When forming a new habit, consistency in performing the behaviour within a stable context helps reinforce the habit-forming process, making it more likely to become automatic.
Breaking existing habits presents unique challenges, as these behaviours are often deeply ingrained in our daily routines and connected to emotional triggers. The process requires not only resisting the urge to engage in the unwanted behaviour but also replacing it with a healthier alternative. Research indicates that successful habit change often involves modifying environmental cues and establishing new reward systems.
Strategies for successful habit change
1. Identify the habit loop: Understanding the cue, routine, and reward associated with a habit is the first step in changing it. By diagnosing these components, individuals can gain insight into their behaviours and begin to re-engineer their habit loops.
2. Replace bad habits with healthier alternatives: Rather than attempting to eliminate a bad habit entirely, it can be more effective to replace it with a healthier behaviour that provides a similar reward. For example, if someone is trying to quit smoking, they might substitute the act of smoking with taking a walk or chewing gum. This strategy leverages the brain’s tendency to follow routines while fulfilling the underlying need that the bad habit catered to.
3. Set small, achievable goals: Breaking a habit is often a gradual process that requires patience and persistence. Setting small, incremental goals can help individuals avoid feeling overwhelmed and increase their chances of success. For instance, someone looking to exercise regularly might start with a goal of walking for just ten minutes a day, gradually increasing the duration and intensity over time.
4. Create a supportive environment: The environment plays a vital role in habit formation and change. Modifying surroundings to eliminate triggers associated with bad habits can significantly enhance the likelihood of success. For example, if someone tends to snack on unhealthy foods while watching television, removing those snacks from the home can help reduce temptation.
5. Practice self-compassion: The journey of habit change is rarely linear, and setbacks are a normal part of the process. Practising self-compassion and understanding that mistakes are opportunities for growth can help individuals maintain motivation and commitment to their goals.
6. Visualise success: Mental rehearsal can be a powerful tool in habit change. Visualising successfully engaging in the desired behaviour can reinforce commitment and increase chances of following through in real-life situations.
7. Track progress: Monitoring progress through diaries or apps can provide valuable feedback and motivation. Celebrating small victories along the way can boost confidence and reinforce the commitment to change.
8. Anticipate pitfalls: Recognising common pitfalls, such as trying to change too many habits at once or relying solely on willpower, can help individuals navigate the challenges of habit change. Focusing on one habit at a time and developing a clear plan can prevent feelings of overwhelm.
9. Build resilience: Cultivating a resilient mindset is essential for overcoming the challenges associated with habit change. Resilience allows individuals to embrace change as a normal aspect of life and empowers them to take bold steps toward improvement.
10. Seek support: Enlisting the help of friends, family, or support groups can provide encouragement and accountability, making the process of habit change feel less isolating.
Changing habits is a complex and multifaceted process that requires a deep understanding of the underlying mechanisms at play. By recognising the neurological patterns that govern habit formation and employing effective strategies for change, individuals can successfully break bad habits and cultivate healthier behaviours. The journey may be challenging, but with patience, persistence, and the right mindset, it is possible to transform habits.
Links:
Lally, P., van Jaarsveld, C.H.M., Potts, H.W.W. and Wardle, J. (2010) ‘How are habits formed: Modelling habit formation in the real world’, European Journal of Social Psychology, 40(6), pp. 998-1009. doi: 10.1002/ejsp.674.
Wood, W. and Rünger, D. (2016) ‘Psychology of Habit’, Annual Review of Psychology, 67, pp. 289-314.
UCL (2009) ‘How long does it take to form a habit?’, UCL News. Available at: https://www.ucl.ac.uk/news/2009/aug/how-long-does-it-take-form-habit#:~:text=It%20takes%20an%20average,Lally%20and%20colleagues%20from (Accessed: 1 June 2025).
Gardner, B. (2012) ‘Busting the 21 days habit formation myth’, UCL Blogs. Available at: https://blogs.ucl.ac.uk/bsh/tag/66-days/#:~:text=behaviour%20%28e.g.%20drinking%20a,the%20behaviour%20felt.%20Participants (Accessed: 1 June 2025).
van der Weiden, A., Benjamins, J., Gillebaart, M., Ybema, J.F. and de Ridder, D. (2020) ‘How to Form Good Habits? A Longitudinal Field Study on the Role of Self-Control in Habit Formation’, Frontiers in Psychology, 11, p. 560. doi: 10.3389/fpsyg.2020.00560.
Ma, H., Wang, A., Pei, R. et al. (2023) ‘Effects of habit formation interventions on physical activity habit strength: meta-analysis and meta-regression’, International Journal of Behavioral Nutrition and Physical Activity, 20, p. 109. doi: 10.1186/s12966-023-01493-3.
UNC (no date) ‘Changing habits’, University of North Carolina Learning Center. Available at: https://learningcenter.unc.edu/tips-and-tools/changing-habits/ (Accessed: 1 June 2025).
