Emilly Murray said the drug came with ‘one unwanted side effect’

Lula White (SWNS) and reg-msp Administrator

20:55, 07 Feb 2026

Emilly before and after the weightloss (Image: SWNS)

A mum who lost 7st on Mounjaro says the “one thing” she misses about “being fat” is spending £70 less on her energy bills each month – because now she has to crank up the heating due to so-called ‘MJ freeze’.

Emilly Murray, 35, says she went from 16 stone and a size 22 to nine stone and a size 6-8 in less than a year after she decided to start taking jabs, but now says she “spends her life freezing”.

The Mounjaro side effect – struggling with the cold – is now known on TikTok as MJ Freeze, with hundreds of weight loss jab users struggling to stay warm in the winter temperatures.

The mum-of-three keeps her heating on 22 degrees for over six hours a day, while also wrapping up in multiple layers and dressing gowns at home – causing her monthly bill to rocket from £85 to £155.

Emilly from Aintree, Liverpool, said: “It is absolutely horrendous. I felt the coldness within the first jab, I was sat in bed shivering with a hoodie on.

“I love being seven stone lighter – but it has come with an unwanted side effect. This winter I haven’t felt my toes or fingers once. It doesn’t feel like when you are cold normally.

“You can’t feel your fingers, and when you drink water you feel even colder, which is concerning because water intake is an important part of weight loss jab journeys.

“At home, now I am always wearing a dressing gown, a heated blanket, heated gloves, heated slippers – and carrying a hot water bottle.”

Emilly purchases Mounjaro privately – now paying £200 per month for a 7.5 dose jab.

Emily Murray before her weight loss. (Image: Emily Murray© SWNS)

This, alongside the additional £70 in heating, costs her £270 every four weeks, but she insists the cost is “worth every penny” as loosing weight as enabled her to run after her kids and climb the stairs without getting out of breath.

But she says that the cold feeling she has affects her daily tasks. She said: “Every time I have to take my boy to school on a Friday, I have to put on thermals under my normal pants.

“Under my normal pants is another pair of pants – then I have two t-shirts, a jumper, a big coat and gloves. Even with all of these layers I am still freezing to my core!”

Emilly believes that there is a reason why Mounjaro users tend to freeze up. She said: “I think its from the lack of eating. I had gone for eating a massive amount of calories to less – our bodies are used to eating high amount – so your body has a lot less energy to burn for heat.

“I have not met a single person on Mounjaro who hasn’t had MJ freeze. I lost 7st on Mounjaro, that is a huge calorie deficit – of course I’m going to be cold, I have no inner heating any more.”

Despite struggling daily with UK’s winter temperatures, Emilly stresses that she wouldn’t come off of the weight loss jabs because of feeling cold.

She said: “I decided to go on them because at my heaviest I was over 22st. I lost weight on my own, but I was struggling.

“I am capable of losing weight – I know what to do and got myself to 16st without jabs – but it was the food noise that was my issue, I just always wanted to eat.

“I was just going to try Mounjaro for the month – within in a couple of hours my head was quiet, no more food noise. Food didn’t rule my life again, I was in charge.

“It’s worth going through this cold – you just need to be prepared to get higher heating bills.”

Emilly after the weightloss. (Image: Emily Murray / SWNS)

Dietitian specialising weight management, Sioned Quirke, has explained the sudden chills experienced by Mounjaro users may not be a direct link to the jab itself.

“There is no robust clinical trial evidence that GLP-1 drugs directly cause people to feel cold as a pharmacological side effect,” she said.

“However, there are some metabolic reasons why people could feel cold called ‘Adaptive Thermogenesis’ after weight loss.

“Significant weight loss reduces subcutaneous fat, which normally acts as insulation.

“Lower caloric intake reduces heat production, because diet-induced thermogenesis and resting energy expenditure drop during weight loss.

“Adaptive metabolic slowing often seen during weight loss reduces heat generation as the body conserves energy.”