Over the years, viewers began to trust Dr. Oz so much, no medical questions were off-limits…even ones that dealt with the most personal, embarrassing topics.

Watch Dr. Oz tackle awkward questions.

Oprah says she'll never forget Maureen, a mom who told Dr. Oz that she suffered from diarrhea, constipation and hemorrhoids. When she did have a bowel movement, she said her stool looked like tiny marbles. At the time, Dr. Oz said a person's poop should ideally be S-shaped .

What happens after you make an embarrassing admission on national TV? As soon as she got home, Maureen says people started calling. "They were saying, ''Oh, I have a similar problem. I can't believe it.' or ''What's your poop like now?'" she says. "I have to admit, I don't know if I ever got the S. I think my tiny marbles changed to kind of like a banana. I'm like the Chiquita girl now."