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In a pair of diary studies, the psychologist Wendy Wood asked students to write down what they were doing at every waking hour. Roughly a third to a half of the behaviours they recorded were repeated almost every day, usually in the same place. In other words, a third or more of what you do is not chosen at all – it is simply replayed.
Neuroscientists at MIT have shown that the brain packs a repeated sequence of actions into a single unit, a process Ann Graybiel calls chunking, a term she borrowed from memory research. Once a routine has been chunked, it no longer needs your attention: a cue in the environment starts it and a small reward tells the brain to keep it. That loop of cue, routine and reward is remarkably efficient, which is exactly why unwanted habits are so hard to switch off.
You have probably heard that a new habit takes twenty-one days to form, but that number comes from a plastic surgeon's book published in 1960, not from research on behaviour. When Phillippa Lally's team at University College London followed volunteers who were building a new daily routine, the median was sixty-six days, and their model suggested that some people would need far longer. Her data held better news too: missing a single day did not materially affect the process, though other work suggests a whole missed week does.
If willpower were the answer, the people with the most self-control would be the ones resisting temptation all day long. Studies of self-discipline suggest the opposite: people who score highly on self-control report fewer struggles, because they have arranged their lives so that temptation rarely appears. Wood refers to this effect as friction: make the behaviour you want to build slightly easier and the one you want to drop slightly harder.
Peter Gollwitzer's research points in the same direction, with a technique called implementation intentions. Instead of promising yourself that you will exercise more, you write a specific if-then plan and let the situation do the remembering for you. Habits are built by repetition rather than by motivation, so the useful question is not how badly you want to change, but what your kitchen, your phone and your morning routine make easy.