This Morning's health experts have suggested Adele's alleged '1000-calorie-a-day' diet isn't sustainable in the long term.
The 31-year-old singer is rumoured to have shed a whopping seven stone in recent months due to a calorie-controlled diet, according to recent claims made by her one-time PT Camila Goodis.
Speaking on Wednesday's installment of This Morning, food writer Dale Pinnock - aka the Medicinal Chef - warned the diet could have adverse side effects such as brain fog and irritability.
Diet plan? This Morning's health experts have suggested Adele's alleged '1000-calorie-a-day' diet isn't sustainable in the long term (pictured left last weekend)
The conversation came during a chat about Adele's transformation, with the singer looking stunning in her latest snap taken over the weekend.
Dale explained: 'If you've got a short-term goal that kind of approach could be very, very suitable - if you want to lose weight for a wedding or holiday.
'But it isn't sustainable. There will be a cut off because after a while your body will start to down regulate the things it will do.'
He reminded people at home that the recommended daily intake for a woman is between 1,800 and 2,000 calories.
'[The body's] top priority is survival, after a couple of weeks you won't be as active, you'll find that you get brain fog and become irritable, it kicks in quite quickly.
'Slow and steady wins the race, definitely - find something that you can stick to.'
'Slow and steady wins the race': This Morning's resident doctor Zoe Williams and food writer Dale Pinnock - aka the Medicinal Chef - reminded people at home that the recommended daily intake for a woman is between 1,800 and 2,000 calories
Weight loss: The 31-year-old singer (pictured in February 2016) is rumoured to have shed a whopping seven stone in recent months due to a calorie-controlled diet, according to recent claims made by her one-time PT Camila Goodis
This Morning's resident doctor Zoe Williams was in agreement, advising viewers to make small changes they will be able to stick to.
She said: '1000 calories a day isn't sustainable and you set yourself up to fail. Make small changes you can stick to for the rest of your life.'
'Brazilian body wizard' Camila appeared on Lorraine earlier this year, where she gave a unique insight into the gruelling regime that has helped Adele.
But in recent weeks, several fitness industry experts have spoken out about the rumoured diet.
Instagram star Alice Liveing, 26, hit out at Camila on social media for promoting a green juice diet and 'riding on the coat tails of a celebrity client.'
Debate: Adele's reported 1,000 calories a day diet previously sparked outrage in the fitness community, after the singer's former trainer shared the secret to her 7 stone weight loss (pictured in December)
In an impassioned post, personal trainer and nutritionist Alice, who goes by the name Clean Eating Alice, said: 'For the record, no credible trainer would agree to their client eating only 1,000kcals 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.
'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.
'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.
Brazilian body wizard: Camila Goodis (pictured) appeared on Lorraine earlier this year where she gave a unique insight into the gruelling regime that has helped the musician
Fury: Instagram star Alice Liveing, 26, hit out at Adele's ex PT Camila, 36, on social media on Thursday for 'riding on the coat tails of a celebrity client'
Drastic: Adele's former personal trainer said the singer stuck to a strict diet of 'green juice and 1,000 calories a day' (pictured earlier this month)
Unhealthy: In an impassioned post, personal trainer and nutritionist Alice said: 'For the record, no credible trainer would agree to their client eating only 1000kcals a day'
Loyal: Alice continued she has trained celebrities herself but wouldn't boast about it on TV, so as to not betray her client's privacy
'It makes them the instigator of seriously disordered eating habits and the health repercussions that accompany it.'
Alice continued she has trained celebrities herself but wouldn't boast about it on TV, so as to not betray her client's privacy.
'I'm not going to get on to Lorraine riding on the coat tails of a celebrity client,' she said.
'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.'
Alice has become a health and fitness Instagram sensation.
Fitness guru: Alice has become a health and fitness Instagram sensation and has more than 600,000 followers on Instagram (pictured in October)
Thanks to the no-nonsense healthy recipes and simple workout regimes, she has garnered more than 600,000 followers and recently launched her own gymwear range with Primark.
Her debut book The Body Bible was so successful it outsold well-known bakers like Mary Berry, Deliciously Ella and Jamie Oliver.
Alice was once a binge eater and yo-yo dieter but shed four dress sizes after finding a love for fitness.
The Instagram star has been vocal about her own journey, admitting she was once addicted to working out but now encourages her followers to have a healthy relationship towards exercise and eating.
Celeb clientele: Camila describes herself as 'a Brazilian body wizard', was introduced to Adele through Robbie Williams' wife Ayda
Before and after: The Los Angeles-based personal trainer revealed the changes to Adele's body are largely down to significant decrease in her calorie intake (pictured, left, in 2016)
On Lorraine, Los Angeles-based personal trainer Camila revealed the changes to Adele's body are largely down to significant decrease in her calorie intake, cutting the recommended daily allowance for females of 2,000 calories by half.
'She's working out but I think 90 per cent of it is diet,' Goodis tsaid.
'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.'
The instructor, who describes herself as 'a Brazilian body wizard', was introduced to Adele through Robbie Williams' wife Ayda and even gave them a joint workout in the former Take That star's Los Angeles mansion.
Her online biography says she uses 'a variety of Pilates and core strength training exercises'.
Revelation: 'She's working out but I think 90 per cent of it is diet,' 'Brazilian body wizard' Goodis told show host Lorraine Kelly
She recalled: 'When she came for a work out I didn't know it was her and when she left I thought 'Oh it looks a little bit like Adele'.
'She looks amazing - she's changed her lifestyle and diet.'
Speaking to The Sun in January, the fitness coach claimed the singer's weight loss is mostly down to dieting because she doesn't like exercise.
'I trained Ayda [Field] for a long time and it happens that they are good friends so I did Adele when she was there in Robbie's house,' she said.
'I don't believe she liked exercise much but she has changed her lifestyle and I believe that 90 per cent was dieting.
Stunned: Adele left fans shocked over the festive season when she unveiled her amazing weight loss at a Christmas Party (pictured)
The singer has wowed fans with her weight loss, which she first unveiled over Christmas and also showed off during a holiday to Anguilla with Harry Styles earlier this month.
It is believed the Rolling In The Deep hitmaker transformed her physique after a dietary overhaul but was inspired to do so for her son, Angelo, seven.
A source told People earlier this week: '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 mum possible.
'Her whole focus during the weight loss journey has really been all about how she can be healthier and how can she treat her body better. It was never about losing weight.'
Feeling better: It is understood the Rolling In The Deep hitmaker transformed her physique after a dietary overhaul but was inspired to do so for her son, Angelo, seven (pictured in 2017)
Lexi crossed paths with the singer at the Blanchards Restaurant and Beach Shack in Anguilla.
She said: 'She said she lost something like 100 pounds, and that it's such a crazy positive experience. She seemed so happy, and she looked amazing.'
The teenager said that the singer's weight loss was evident as she met her in the eatery.
Lexi added Adele did not want to take a picture with her as Angelo was present at the time, but did bring over Harry to chat to her group of pals in the restaurant.
She revealed that she and a group of pals spoke with the British stars for around 15 minutes and discussed college life and their future plans.
WHAT IS THE SIRTFOOD DIET?
The Sirtfood Diet is based on sirtuins (SIRTs), a group of seven proteins
It focuses on plant foods which help to suppress appetite and activate the body's 'skinny gene'
Followers of the diet go through two diet cycles that last for three weeks
Recommended Sirtfoods include: Kale, red wine, strawberries, onions, soy and dark chocolate (85% cocoa)
The diet has been criticised for failing to provide any long-term benefits
Back in October, Adele joked that she 'used to cry but now I sweat' in an Instagram post, as details of her overhauled fitness regime emerged.
It's understood that her huge transformation has been a result of reformer pilates, using weights in the gym, cutting down on sugar and also following The Sirtfood Diet.
The regime focuses on plant foods, such as kale and buckwheat - which help to suppress appetite and activate the body's 'skinny gene'.
The diet's creators claim that following the Sirtfood Diet will lead to rapid weight loss, all while maintaining muscle mass and protecting you from chronic disease.
Followers of the diet go through two diet cycles that last for three weeks - following specific recipes and plans - and they are then encouraged to continue adding as many sirtfoods as possible into their food.
However, Healthline report that although the low-calorie diet may kick-start weight loss, it is too short to have a long-term impact on health.
Speaking in June, sources claimed Adele's her new workout regime had given the vocal talent a 'new lease of life' following her split from ex-husband Simon Konecki - with whom she shares son Angelo.
Adele confirmed her split from Simon in April 2019 and filed for divorce in September
The vocal powerhouse and Simon first began dating in 2011 and welcomed their son the following year, before tying the knot four years later.
All over: Sources previously claimed her new workout regime has given the vocal talent a 'new lease of life' following her split from ex-husband Simon Konecki (pictured in 2013)
Candid: Back in 2015 (right) Adele revealed she had switched to a healthier lifestyle in order to keep her voice in good condition (pictured left in 2008)