The "21 Days to Build, 60 Days to Break" Delusion: Why Habits are Systems, Not Timelines
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||| Why Knowing Isn't Enough
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FREE Ebook ||| Why Knowing Isn't Enough 〰️
Subtitle: The Habit Automation myth
Series: Busting myths
You’ve probably heard this before. “Repeat a behavior for 21days then it becomes a habit.” and “To break a habit, stop it for 60days”. I am not really sure how we got away with this outrageous claim. Because as a dietitian, I have witnessed people consistently exercise or adhere to a diet plan for several months, yet, randomly stop following through. So my question is, “how long does a behavior need to be repeated for a habit to form?” Let me put it this way. Does habit automation, as we have believed, really happen?
To go deeper, let’s understand how habit forms in the brain. A behavior is usually initiated by the prefrontal cortex– the part of the brain responsible for decision making, logical reasoning, planning, collectively known as the Executive function. For instance, the first time you start exercising, your prefrontal cortex initiates it consciously, but at the cost of tremendous mental energy. Over time, as you consistently exercise under stable conditions, you begin to use another part of your brain to initiate the behavior–The basal ganglia. Once the basal ganglia takes control of the behavior, your prefrontal cortex rests, saving you energy.
At this point, exercising has moved from a conscious to a subconscious state. This is Habit Automation, when behavior activation moves from the prefrontal cortex to the basal ganglia, specifically the Striatum of the brain. Here, there is no mental negotiations, decision fatigue, dopamine spikes, motivation or even discipline. Your brain has simply moved the behavior to autopilot. You don't need to think too much before going for a walk, because it has become as easy as brushing your teeth. It sounds so easy, doesn’t it? Yet, it bears the question: If habits become fully automatic, why do they disappear during stress, illness, life transitions, or environmental changes?
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Most habit models have already established that habit automation relies on triggers and rewards. Like, if you workout at 6am everyday, your brain would take that as a cue, attach it to the activity (your workout routine) and the reward (how you feel afterwards). When this continues for a while, your brain rewires itself through neuroplasticity by creating neural pathways. These pathways ensure that the time between the cue and activity is shorter. That’s why you don't need to think about it before you do it since the behaviour has been physically carved into your brain. Unfortunately, it is why bad habits are also difficult to break.
But here is the problem. This process must happen under stable conditions. So habit automation isn't time-bound, instead, it is dependent on the conditions through which the behavior is repeated. What does this mean for you? It means it doesn't matter whether it is 21 or 60days, if the conditions aren't stable, automation cannot occur. I once heard someone say this, “ If you are putting a time on it, you’ll not succeed”.
Imagine having ice cream anytime you're stressed. With time, your brain associates stress with ice cream. Stress becomes the trigger, eating ice cream is the activity and the reward is the feeling you get. When these conditions are repeated enough, your brain starts expecting ice cream whenever you are stressed. Now, you’ll realize that habits don't stick because they were simply repeated, rather, they stick because they were repeated enough under similar conditions. Conditions such as cognitive load, emotional stress, physiological changes and environmental disruptions make every habit vulnerable.When cognitive, emotional, or physiological resources decline, the same habit becomes harder. In fact, stress hormones can force your brain back into old habits by altering neural communication. This means habit automation is neither absolute nor resistant to relapse. Because it is still dependent on your body and environmental capacity to sustain execution.
That’s why when your routine destabilizes, the habits get shaky too. Because the conditions that were present when they were formed are no longer available. This forms the basis for many self-help books and habit models–By eliminating friction, behavior sticks better. Hence, meal planning, life planners, sleep schedule, environmental design, etc. work because they create stable conditions for the behavior to occur. Think of it this way. Meal prepping reduces decision fatigue, laying out gym clothes reduces friction, and better sleep improves executive function.
Final Insight
To sum it all, habits aren’t merely automatic behaviors, rather, they are behaviors that require less activation energy under familiar conditions to be repeated. However, repetition does not eliminate the forces acting against it. A behavior may gain momentum, yet momentum can still be slowed, redirected, or stopped when opposing forces become sufficiently strong, regardless of how long it has been active. But the good news is, habits do not completely disappear, they get dormant when the required conditions aren't there. Of course, that’s to say bad habits never get completely erased either. You’d agree with me that the 60days rule doesn't hold because many bad habits reappear years later when cues return. So instead of "How long does it take for a behavior to become automatic?" A better question is: “Under what conditions can this behavior continue to occur?”
“I can’t wait for the next release”
If you’ve ever felt like you’re the problem, this will help you see what’s actually happening. I ‘d love to send you the full breakdown of the Framework: Understanding the Knowledge to Action Gap