How habits form: why you do things you never decided to do
How long it takes to form a habit, and why it is not 21 days
Day 21 is circled on the calendar, and the new habit still takes a push. Where does the famous 21 days come from, and what did a real study find?
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Day 21. You sit down after dinner and reach for the guitar, but it still takes a push. On some evenings, the phone still wins. Did you do something wrong?
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In a study published in 2010, Phillippa Lally's team in London measured it. 96 people each picked one new daily action, like a piece of fruit with lunch, and rated every day how automatic it felt.
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