Every habit runs on a three-part loop: a cue that triggers it, a routine you perform, and a reward your brain craves. To change a habit, keep the cue and reward but replace the routine.
Habits run on a loop: cue, routine, reward. Change the routine while keeping the cue and reward.
Charles Duhigg explains that habits aren't a single behavior but a loop with three parts. First comes the cue — a trigger that tells your brain to go on autopilot (a time, a place, an emotion, a preceding action). Then the routine — the behavior itself. Finally the reward — the payoff that tells your brain this loop is worth remembering. Repeat it enough and the loop becomes automatic, firing before you consciously decide.
Because the loop is so wired-in, willpower alone rarely erases a habit. Duhigg's 'golden rule' of habit change is subtler: you usually can't extinguish a craving, but you can redirect it. Keep the same cue and deliver the same reward, but insert a new routine in the middle. A smoker who reaches for a cigarette when stressed (cue) for a hit of relief (reward) can swap the cigarette for a short walk that delivers similar relief. Diagnose the cue and the real reward, and you gain a lever on behaviors that felt beyond your control.
It makes habit change a solvable engineering problem instead of a test of raw willpower.
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