Adele has been warned her 1,000 calorie-a-day diet "isn't sustainable" by This Morning's health expert.
The singer's rumoured eating plan, which reportedly which helped her lose seven-stone, had the Internet in shock, but has since been slammed by health professionals.
This Morning's Dale Pinnock ha snow shared his two cents on the Hello singer's reported diet, saying the method only works for short-term weight-loss goals.
Speaking to Holly Willoughby and Phillip Schofield, Dale revealed the average calorie intake for a woman should be between 1,800 and 2,000 calories a day.
He said: "If you've got a short-term goal that kind of approach could be very, very suitable."
He continued: "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.
"Its 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."
When the health expert was asked what advice he'd give to the singer, he said: "Slow and steady wins the race, definitely - find something that you can stick to."
Fellow guest Dr. Zoe agreed, adding: "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."
It comes as the singer's diet was previously 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."
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