The number of days it takes for a new, healthy habit to stick
It takes two months for a new behaviour you’re trying to adopt – like always eating fruit with lunch or going for a run before dinner – to become automatic. The trick to making it stick? Doing it every single one of those 66 days in the same situation. That’s how it’ll become an automatic reaction (like doing a few sit-ups) in response to a situational cue (like when the ads come on television), say UK researchers.