Oprah Winfrey took accountability for promoting unsustainable methods of weight loss over the years during a three-hour live WeightWatchers special for WeightWatchers.

“I have been a steadfast participant in this diet culture,” the legendary talk show host, 70, said Thursday. “Through my platforms, through the magazine, through the talk show for 25 years and online.

“I’ve been a major contributor to it. I cannot tell you how many weight-loss shows and makeovers I have done, and they have been a staple since I’ve been working in television,” she continued.