Adele was once famed for her love of a cigarette and a sugary brew.
But after having son Angelo nine years ago, the London-born star decided the time had come to make some changes.
Adele, who is performing in the capital's Hyde Park tonight, went on to lose an incredible seven stone in a move that's changed not just her body, but also her mind.
Indeed, those close to the star claim it has transformed her on a personal level.
"There’s a lot to do with her weight loss that has really changed her life, but it’s so much more than that," a friend said.
Indeed, having refused to lose weight for anyone other than herself, the London-born singer first started improving what she ate in 2012.
For the sake of her voice, the first thing she did was to ditch her daily 10 cups of sugary tea and wave goodbye to alcohol, cigarettes, caffeine and all "spicy, citrusy, and tangy" foods.
"It's f***ing boring, but I don't think you take your voice seriously until you've had an accident," she told Australia's 60 Minutes of her 2011 vocal hemorrhage.
"I'm frightened all the time I'm going to damage my voice," she admitted.
In 2016 she shed yet more weight ahead of her tour in a bid to "get some stamina".
And by 2017 she was believed to have lost more than two stone reportedly due to implementing a second change - The Sirtfood Diet.
The food programme sees slimmers fill up on plant-based foods like kale, buckwheat, green tea and tumeric.
The foods are known as sirtuin activators, and are said to control the way the body processes fat and sugar and regulate the appetite in the process.
Green tea and cocoa powder are also on the menu, along with red wine and cheese.
"The Sirtfood Diet is all about losing weight and feeling fantastic through eating great-tasting food," a source told the Daily Mail.
"It's based on extensive research into the power of key plant foods, which when added to our diet turn on fat burning and improve wellbeing."
In a bid to improve her health from all angles, the singer has also made some changes to her fitness regime.
The third step in her transformation was to hire LA 'body wizard' pilates instructor Camila Goodis - who also works with Piers Morgan's wife Celia Walden.
Camila was introduced to Adele through Robbie Williams' wife Ayda Field and says the down-to-earth star still isn't a huge fan of working out.
Camila told The Sun: "I trained Ayda for a long time and it happens that they are good friends so I did Adele when she was there in Robbie’s house.
"I don’t believe she liked exercise much but she has changed her lifestyle and I believe that 90 per cent was dieting."
And despite Adele's dedication, she has refreshingly admitted that she will never, ever, relish going to the gym.
"I mainly moan. I’m not, like, skipping to the f-cking gym. I don’t enjoy it," she told Rolling Stone in 2016.
"I do like doing weights. I don’t like looking in the mirror. Blood vessels burst on my face really easily, so I’m so conscious when I’m lifting weights not to let them burst in my face. And if I don’t tour, you’ll catch me back down at the Chinese!”
