New Celebrity SAS: Who Dares Wins contestant Katie Price said the experience "changed her for life".
The model, 41, was pushed to her limits on the military training programme with 12 other celebrity recruits including reality TV star Joey Essex and former Blue Peter presenter Anthea Turner.
The celebrity recruits left their glamorous lives behind and lived together in a derelict farmstead on the remote island of Raasay on Scotland's west coast - and the experience made a huge impact on Katie.
Katie left the show after 48 hours because she found the process too difficult.
Speaking ahead of the airing of the new series on Monday, Katie said: "I will never take my creature comforts for granted again.
"I left Celebrity SAS: Who Dares Wins with new life goals. I left the old Katie up there and she’s not coming back either!
"You don’t come back from filming a show like this and just wash it off. It stays with you. Life is one big challenge and I want the world to be a better place for everyone."
Katie added the best thing she did during her experience was making friends.
She said: "I made some true friends, met real people. In that short time we were a family. I learnt a lot about who I am and where I am going in life now."
Guiding the celebs was chief Instructor, Ant Middleton and his team Foxy, Billy, Ollie and Jay.
Recruits were forced sleep in basic conditions, eat food rations and take part in dangerous and difficult tasks.
On previous versions of the show, contestants have had to take on hair-raising challenges such as jumping out of helicopters into freezing waters.
Katie has been accused of failing to take the gruelling Channel 4 show seriously, meaning her teammates had to work extra hard to complete their challenges.
She recently admitted she struggled during the process, and blamed it on her recent breast reduction surgery which she said she didn't have enough time to recover from.
A rep for Katie denied claims she didn't take the show seriously, and said she was fighting the pain of an infection brought on by her surgery, leading her to be discharged on medical grounds which she was "gutted" about.
The celebrity version of the Channel 4 reality show is in aid of charity Stand Up To Cancer.
Our new celebrity recruits on the show include ballroom dancer, Brendan Cole, former Premiership footballer, John Fashanu and ex boxing champion, Tony Bellew.
In the opening episode the recruits meet Ant and find out how they will take on tougher challenges than they have ever faced in their lives
The first episode of the new series airs on Monday, April 30th at 9pm.
