Adele was often snapped with a cigarette in one hand and a drink in the other.
But the singer decided to revamp her lifestyle nine years ago following the birth of son Angelo which led to dramatic weight loss.
The Hello crooner has since lost an impressive seven stone, with the health kick changing not only her appearance, but her mindset as well. Indeed, those close to the pop icon say she has transformed almost every aspect of her life.
"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 commented. The London-born star decided it was time to start improving her diet back in 2012, the Mirror reports.
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 turmeric.
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. She 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***ing 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!”
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