Adele 's dramatic weight loss revealed the singer lost a whopping total of seven stone.
Her flaming bod was achieved by eating a meagre 1000 calories per day – but the diet has since been slammed by Clean Eating Alice.
After Adele's personal trainer Camila Goodis, 36, "betrayed" the singer's trust and revealed her diet on Lorraine , Alice took to Twitter to condemn the move.
The Someone Like You singer followed the The Sirtfood diet, which means she ate foods high in sirtuin activators that can regulate your metabolism like green juice, strawberries, tumeric, olive oil and red onion.
Camila, who calls herself the Brazilian body wizard, said Adele's transformation is "90 percent diet".
Camila revealed: "She looks amazing – she's changed her lifestyle she changed diet. I believe now she's into working out, she's been working out more and more but is 90 per cent what she did is diet.
"There is no secret, I didn't help with any diet, She started doing The Sirtfood diet and now she's maintaining it and eating healthy.
"It's a good diet to shed the weight. The first week is intense, green juices and only 1,000 calories. She doesn't look too thin – she looks amazing."
But Clean Eating Alice – whose real name is Alice Liveing – hit out at the Pilates instructor, saying the weight loss had nothing to do with Camila.
In a stern tweet, Alice, 26, wrote: "For the record, no credible trainer would agree to their client eating only 1000kcals a day
"No credible trainer would suggest green juices to be the elixir of good health … No credible trainer would/should share this confidential info for their own gain."
Alice also shared her two cents on Camila's decision to reveal Adele's diet secrets, tweeting: "I have trained celebrities in my time and when asked in interview about said clients, I have always remained silent because of client confidentiality, their privacy and the fact that that is their information to share, not mine."
But the Instagram star, who boasts an impressive 647k followers, didn't stop there.
In a third tweet, she wrote to her 50k followers: "These ‘so called’ celebrity trainers need to realise that putting someone on a 1000 calorie a day diet and an intense workout regime doesn’t make them a good trainer.
"It makes them the instigator of seriously disordered eating habits and the health repercussions that accompany it."
She added: "I’m not going to get on to Lorraine riding on the coat tails of a celebrity client.
"If I ever do get on TV it will be because I am a credible trainer in my own right and I don’t need to compromise their privacy to further my career."
It's claimed the songstress was spurred on by "not feeling great" and wanting to change something about her life following the breakdown of her marriage last year.
Adele apparently wanted to be healthier for her son Angelo, seven, whom she shares with her now-ex husband Simon Konecki.
A source told PEOPLE : "She got to the point where she didn't feel great. She knew she had to change something, because she wants to be the healthiest mom possible."
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