In January, Oprah Winfrey launched her nine-city tour called "Oprah's 2020 Vision: Your Life in Focus" as a way to motivate and inspire fans to live their healthiest and most fulfilled lives.

"How do you take this energy of inspiration and people feeling triumphant in their lives? How do you use that to something that's a greater good than just my front porch?" Oprah asked guests at her first tour stop in Fort Lauderdale, Florida, Entertainment Tonight reported. "And that's how this idea came about. I'll try to spread that word around the country."

The tour, which is in partnership with weight-loss program Weight Watchers (now known as WW), will also run in cities like Dallas, Texas; San Francisco, California; and Los Angeles, California, with guests including Michelle Obama, Jennifer Lopez, Gayle King, and Tina Fey.

Oprah's mission to teach people how to live their best and healthiest lives is at the core of both her tour and personal brand, but this is hardly her first foray into the topic. The former talk show host has interviewed celebrities on everything from vaccines to youth-enhancing remedies, and discussed her own health practices like meditation and healthy eating.

Here are the best and worst health tips Oprah has talked about over the years.

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Oprah's best and worst health advice from almost 5 decades as a talk show host and trend-setter - Insider - INSIDER