About the Study

  • About the Study Video
  • 2:31

The Ontario Health Study is one of the largest long-term health studies in Canada. Since 2010 over 230,000 Ontarians have taken a short online survey to help researchers better understand the causes of chronic diseases like cancer, heart disease and diabetes, and to develop new ways to prevent and treat them. If you live in Ontario and you’re 18 years or older, you’re eligible to participate. A small investment of your time today will help to improve public health for generations to come.


  • Community Video
  • 1:04

This is the place to go for Study updates, videos and the scoop on when we’ll be in your neighbourhood. The answer to how you can become a Community Champion and play a part in building one of the world's largest health studies is here as well!


  • Privacy Video
  • 1:35

We understand how important your privacy is to you. Rest assured that the Ontario Health Study takes protecting the confidentiality of your information seriously. To learn about the safeguards we have put in place, please visit our Privacy page.