It seemed the challenge also rekindled memories of being bullied as a child, an issue she has often spoken about.
During the episode of Running Wild, broadcast on US network NBC, the British mother of three spoke of how she was constantly teased about her appearance while growing up in Reading.
She said: "I was bullied at school. I was chubby, always had big feet, the wrong shoes, bad hair. There was one girl who was particularly horrible to me."
Years later, after hitting the big time following her role in 1997's Titanic, she finally confronted her tormentor.
Winslet added: "She was working on a beauty counter in a department store.
"I went up to her and said, 'I want to thank you for being such a b***h because it made me a lot stronger'."
She added: "When I grew up, I never heard positive reinforcement about body image from any female in my life.
"I only heard negatives. That's very damaging, because then you're programmed as a young woman to immediately scrutinise yourself and how you look."
Winslet said she tried to create a happier, more positive atmosphere for her 14-year-old daughter Mia, from her first marriage to director Jim Threapleton. She added: 'I stand in front of the mirror and say to Mia: "We are so lucky we have a shape. We're so lucky we're curvy". And she'll say, "Mummy, I know, thank God".'
In 2008, Miss Winslet described how her classmates used to call her Blubber and lock her in a cupboard.
Other celebrities to appear with Grylls on the survival programme include actress Kate Hudson and comedian Ben Stiller.
- Daily Mail
