Uploaded July 2026 | Updated September 2026, 2 weeks ago

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The idea that habits form in 21 days is a myth.

This is the first video in a three-part series. Stay tuned for How to Break Bad Habits (nutritionfacts.org/video/how-to-break-bad-habits) and How to Form Good Habits (nutritionfacts.org/video/how-to-form-good-habits).

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Have a question about this video? Leave it in the comment section at nutritionfacts.org/video/how-long-does-it-take-to-form-healthy-habits and someone on the NutritionFacts.org team will try to answer it.

Want to get a list of links to all the scientific sources used in this video? Click on Sources Cited at nutritionfacts.org/video/how-long-does-it-take-to-form-healthy-habits. You’ll also find a transcript and acknowledgements for the video, my blog and speaking tour schedule, and an easy way to search (by translated language even) through our videos spanning more than 2,000 health topics.

Thanks for watching. I hope you’ll join in the evidence-based nutrition revolution!
-Michael Greger, MD FACLM

Captions for this video are available in several languages; you can find yours in the video settings. View important information about our translated resources: nutritionfacts.org/translations-info

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