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I lost 5 stone in 9 months on fat jabs – I’ve always dreamed of being skinny but wasn’t warned about painful side effect

Published on March 31, 2025 at 08:37 AM

Weight Loss Jabs - Pros vs Cons

A WOMAN who lost five stone in nine months on fat jabs has admitted there's a “painful” side effect that no-one warned her about.

Bethany has been taking Mounjaro for almost a year, and has gone from a size 18 down to a size 10.

Woman showing stage 1 lipoedema after 9 months on GLP-1 (Mounjaro).
Bethany has gone from a size 18 to a size 10 in just nine months – losing a whopping five stone on Mounjaro
Woman showing stage 1 lipoedema after nine months on GLP-1 (Mounjaro).
But she admitted in a video on her TikTok page that there's a “painful” side effect of the injection that no-one warned her about
Mounjaro (tirzepatide) injection pen and box.
The GLP-1 jabs work by suppressing your appetite, making you eat less so your body burns fat for energy instead, and you lose weight

However, in a video on her TikTok page, she admitted “nobody told” her about one of the things that happens “when you lose a lot of weight”.

Namely, that it's “actually quite uncomfortable to be skinny”.

Despite spending her “whole adult life wanting nothing but to be skinny”, Bethany had no idea that her bones would end up being “really f**king annoying”.

She said she's not sure whether or not she has “prominent bones” genetically, or if it's just because they'd been “so comfortable” in her “larger body” up until this point.

“But I am very, very consciously aware of my bones 24 hours of the day,” Bethany sighed.

Not only can she feel her tailbone “rubbing against the bottom of the bath” whenever she takes a soak, she also finds her bones digging into her mattress when she sleeps, because she does so on her side.

She's also not a fan of how her “kind of gross” ribcage looks when she lays down flat, or how her knees feel when she “kneels down to get something”.

“I'm really hoping this passes because my bones are actually giving me the ick right now,” she concluded.

“So, that's fun.”

“Is this just me or is this a thing?” Bethany captioned her video, which has had over 40,000 views on TikTok.

Inside Hollywood's worrying obsession with fat jabs - and what newly slimline Christina Aguilera really thinks of Ozempic claims

And viewers were quick to take to the comments section to weigh in on her take on her weight loss journey, as many admitted they'd suffered similar side effects.

“I have to sleep with the duvet between my knees now,” one sighed.

“All of this! And I’m cold!” another added.

“Sitting on a hard surface?” a third questioned.

“Oh God, yes, my ass hurts all the time now!” someone else replied.

“The toilet seat hurting because there’s no padding,” another complained.

Everything you need to know about fat jabs

Weight loss jabs are all the rage as studies and patient stories reveal they help people shed flab at almost unbelievable rates, as well as appearing to reduce the risk of serious diseases.

Wegovy – a modified version of type 2 diabetes drug Ozempic – and Mounjaro are the leading weight loss injections used in the UK.

Wegovy, real name semaglutide, has been used on the NHS for years while Mounjaro (tirzepatide) is a newer and more powerful addition to the market.

Mounjaro accounts for most private prescriptions for weight loss and is set to join Wegovy as an NHS staple this year.

How do they work?

The jabs work by suppressing your appetite, making you eat less so your body burns fat for energy instead and you lose weight.

They do this my mimicking a hormone called GLP-1, which signals to the brain when the stomach is full, so the drugs are officially called GLP-1 receptor agonists.

They slow down digestion and increase insulin production, lowering blood sugar, which is why they were first developed to treat type 2 diabetes in which patients' sugar levels are too high.

Can I get them?

NHS prescriptions of weight loss drugs, mainly Wegovy and an older version called Saxenda (chemical name liraglutide), are controlled through specialist weight loss clinics.

Typically a patient will have to have a body mass index (BMI) of 30 or higher, classifying them as medically obese, and also have a weight-related health condition such as high blood pressure.

GPs generally do not prescribe the drugs for weight loss.

Private prescribers offer the jabs, most commonly Mounjaro, to anyone who is obese (BMI of 30+) or overweight (BMI 25-30) with a weight-related health risk.

Private pharmacies have been rapped for handing them out too easily and video calls or face-to-face appointments are now mandatory to check a patient is being truthful about their size and health.

Are there any risks?

Yes – side effects are common but most are relatively mild.

Around half of people taking the drug experience gut issues, including sickness, bloating, acid reflux, constipation and diarrhoea.

Dr Sarah Jarvis, GP and clinical consultant at patient.info, said: “One of the more uncommon side effects is severe acute pancreatitis, which is extremely painful and happens to one in 500 people.”;

Other uncommon side effects include altered taste, kidney problems, allergic reactions, gallbladder problems and hypoglycemia.

Evidence has so far been inconclusive about whether the injections are damaging to patients' mental health.

Figures obtained by Flying Eze show that, up to January 2025, 85 patient deaths in the UK were suspected to be linked to the medicines.

“I thought my mattress was lumpy....nope just my hip bone being there!” someone else admitted.

“I have seen no one else mention this!! So true!” another praised.

As someone else said they “can't sit comfortably, cant lay sideways in bed because my knees and ankles bash together and my sternum feels weird”.

“Yep,” another agreed.

“My comfy bed is now trying to harm me, the sofa may as well be made of concrete,

“I’m almost certain there is no actual padding in my desk chair and no one warned me.

“Bones are a 0/10!”

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