Prue Leith has revealed the huge mistake she made with Mounjaro jabs that left her 'starving, feeling awful and sleeping all day' after a weight loss attempt went wrong. 

The Great British Bake Off judge took to This Morning to open up about her experience of using the jabs to hosts Cat Deeley and Ben Shephard. 

Prue, 85, admitted that she made an error when she began taking the weight loss jabs, inspired by her husband John, who used the jabs to help shed the pounds. 

Instead of properly reading instructions for the jabs, Prue admitted that she 'didn't eat anything and was starving' which stopped her from losing any weight. 

Instead, the TV presenter and chef was left 'sleeping all the time' and 'felt awful', because her body had gone into 'starvation' mode, stopping her from losing weight. 

Prue said: 'The only reason I did it was because of John, he lost about two stone in a couple of months, and he looked great, and he loved it - and it was much better for his diet, as he was eating much less and much healthier. 

'I thought, "This is easy, and if its so easy for him, then I'll do it", but I absolutely hated it, I just felt awful, I wanted to sleep all the time.

'It was my fault, I didn't read the instructions that you have to eat and you have to exercise, and I didn't eat anything and I was starving, so my body just said, "Since this is starvation mode, I'm not going to lose anything".

'I didn't lose any weight, but I didn't put on anything either.' 

It comes after Prue opened up to the Daily Mail about her experience using the jabs.

She wrote in a column: 'After 60 years of frequent efforts to lose weight, all of them requiring self-control and persistence I didn’t always have, and all of them only temporarily successful, the thought of effortless weight-loss seduced me.

'The final decider was John claiming actually to enjoy his food far more now that he was no longer snacking all day and wolfing down cake and puddings.

'But, sadly for me, the jabs were an absolute disaster. If I’d bothered to read anything about it, I’d have realised that you must eat at least 1,000 calories a day.

'But I was so un-hungry, I couldn’t manage even half of that. You cannot survive on 200 calories a day, which is what I was eating when on Mounjaro. 

'The advice, which I hadn’t read so didn’t take, is to do a decent amount of exercise and to make sure you eat protein – just cut down the carbs and the fat.

'But I didn’t want to put anything in my mouth at all. John would force me to swallow a few mouthfuls of yoghurt or a handful of grapes, but I balked at a boiled egg – I just could not swallow it.

'As for exercise: out of the question. I was desperately tired all the time. I just wanted to lie down and sleep. I also felt slightly nauseous.

'I wasn’t losing any weight. Not a single pound. Every day I’d step on those scales and, guess what? 12st.

'Then I stopped. Within a week I no longer felt sick or exhausted and began to get my appetite back. Huge relief, but what a waste of money. Eight weeks feeling under par, wanting to sleep all the time, hating food, and all to no avail.

'I cannot believe I can have been so stupid. I know about the importance of good food. It’s my job.'

It comes after Prue revealed 'horrific' experience that almost derailed her TV career.

The Cordon Bleu-trained cook started out in catering, before opening a Michelin-starred restaurant in Notting Hill and a school for budding chefs. 

She is also a prolific cookbook writer, columnist and author, publishing cookbooks, novels - and her 2013 tell-all memoir Relish.

Her first foray into telly came in the seventies, presenting a show for housewives for Tyne Tees Television, the precursor to the ITV franchise for North East England. 

But Prue said she had such a 'horrific' experience, it left her close to abandoning a career in TV altogether. 

She told Candis Magazine: 'With no previous presenting experience, it would be fair to say I wasn't a natural. 

'I was very bad at it and didn't enjoy it at all. I think [the show] died a death.' 

The ordeal put her off entirely - and for years after this, she did virtually no TV work. 

In fact, despite receiving offers to make further appearances, she turned most of them down in this period.  Instead, the cook chose to feature as a guest on a handful of documentaries in the eighties on topics that interested her.

Everything changed in the early noughties, when her beloved husband, South African author and property developer Rayne Kruger, died in 2002, aged 80. 

The tragedy saw her join the panel on Great British Menu, which sees the country's best chefs compete for the chance to cook a course at a prestigious meal - for diners ranging from royals, to ambassadors, to veterans. 

Prue adored being part of the programme - and stayed for 11 years, until her departure for Bake Off. 

This Morning airs weekdays from 10am on ITV1 and ITVX.