Oprah takes a moment to thank Maureen for asking the question no one else wanted to ask.

"I think the poop question really changed our relationship, Dr. Oz and I," she says. "You opened the door to really a greater sensitivity between the two of us."

After talking about poop on television, she says she realized nothing was off-limits with Dr. Oz. "Nobody likes to talk about it," she says. "Everybody's embarrassed right now, but just think, everybody you're going to see today…they poop."