Building habits

// What the research shows

Lally et al. (2010) followed volunteers who linked a new daily health behaviour to a fixed cue. Among those whose data could be modelled well, it took a medianMedian The middle value: half of the values lie above it, half below. More in the glossary → of 66 days to reach near-maximal automaticity, but anywhere from 18 to 254 days depending on the person and behaviour. Automaticity grows fastest at the start, then levels off. Single missed days did not meaningfully disrupt the process, but very inconsistent behaviour did.

// In practice

• Tie training to a fixed cue, e.g. straight after work or after breakfast.
• Expect months rather than weeks. Hard habits like training take longer than drinking a glass of water.
• Missed a day? Just carry on the next. What matters is not becoming permanently inconsistent.

// Limitations & open questions

A single study of around 100 people. The 66 days come only from the subgroup with well-fitting data, and it measured felt automaticity, not habit as such.

// Sources

• Einzelstudie 2010Lally et al. – How are habits formed: modelling habit formation in the real world (Eur J Soc Psychol) ↗

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