The Radio 1 presenter and former Big Brother star revealed that she'd changed her life after reaching 12 and a half stone in 2017.
Adele, who is in a relationship with Kate Holderness, says one day she "woke the f**k up" and dropped the weight by giving up sugar.
The reality star swapped chocolate bars for protein bars and exchanged her usual white baps for sourdough bread.
Just over a year ago, Adele took to Instagram to share an old snap of herself, when she was bigger, and opened up about her weight loss journey.
In the old picture, Adele is sitting down to enjoy an afternoon tea of cakes, sandwiches and other tasty treats.
Her face is visibly fuller and she looks very different to the way she does today.
She wrote: "Hi everybody! Past Adele just wanted to wish you a very happy #throwbackthursday
"I’ve just told her she’s going to run two marathons in the future. She’s just p****d herself laughing and gone straight to the bottom shelf on that cake stand.
"It’s never too late to change Going to take her back to this very spot one day and recreate this photo. Just need to find that bloody t-shirt. It was my favourite. Wore it for Kate’s birthday. Thought I was being dead fancy because it’s got Nike in gold on it
"Currently telling the story of how this little cherub went from cake stands to WAKING THE F*CK UP"
Her followers were blown away.
One said: "what a transformation. Never mind the t shirt, I'm more bothered about the cardy buttoned up"
Another told her: "you’re an inspiration."
Adele also took part in the10-year challenge, sharing side by side images of her now and a decade ago, when she looked dramatically different.
The star is currently living in the jungle, so after a few weeks of living on rations of rice and beans, unless the camp wins some stars, she could end up looking even more different to her before picture.
* I'm A Celebrity airs nightly at 9pm on ITV
Do you have a story to sell? Get in touch with us at [email protected] or call us direct 0207 29 33033