However the Oscar winner said she never read media coverage about her appearance.
"All that I know about is what friends and associates would send in texts and emails," she recalled.
"They were sending support, which means that I must have needed it, and I prefer it that way.
"So when people come up to me to ask, 'How did that feel?', I don't know, and I like it like that.
"I know it sounds pretty unlikely that a person might be able to make herself, I guess, keep clear of those words or of that experience, but I have and it takes effort. But I have succeeded."
At the time, Zellweger told People magazine she was glad people thought she looked different.
"I'm living a different, happy, more fulfilling life, and I'm thrilled that perhaps it shows."
Zellweger's third Bridget Jones film, Bridget Jones's Baby, is due for release next September.
The film will include the return of Colin Firth and introduce former Grey's Anatomy actor Patrick Dempsey to the franchise.
- AAP