The hidden dangers of Ozempic-like fat jabs in hot weather – and ‘double whammy' side effect that can prove fatal
WEIGHT loss jabs have been hailed for their rapid and drastic results, particularly for those who've tried and failed time and again on 'fad diets'.
But like all medicines, the jabs don't come without risk of side effects - one of which could rear its ugly head in this glorious weather.
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For the 1.5 million people in the UK estimated to now be using weight loss injections - primarily through online providers - doctors have warned extra caution needs to be taken during hot weather.
The Met Office predicts that a heatwave is looking likely this weekend - with temperatures exceeding 30C in parts of the UK.
While many Brits will be looking forward to basking in the scorching heat, patients taking weight loss jabs risk dehydration.
Dehydration can lead to a range of health risks, from mild discomfort to serious complications, such as heatstroke, urinary and kidney problems, seizures, and low blood volume shock.
If severe and left untreated, dehydration can even lead to death.
Professor Franklin Joseph, consultant physician and head of Dr Frank's Weight Loss Clinic, tells Sun Health: "Weight loss injections don't just suppress your appetite - they also blunt your thirst.
'People forget to drink because they don't feel hungry or thirsty. But your body still needs fluid - and when you're eating less, you're also getting less hydration from food. It's a double whammy.
"If you're not replacing that fluid, it can creep into mild dehydration quickly - especially in hot weather or during exercise.'
Dr Suzanne Wylie, GP and medical adviser for IQdoctor, adds: "The common side effects associated with these medications, such as nausea, vomiting, and diarrhoea, can also lead to a significant loss of fluids."
Hot weather exacerbates the dehydration, warns Prof Joseph.
Weight Loss Jabs - Pros vs Cons
He says: 'When it's hot, you're sweating more - but if the jab is dulling your thirst, you don't feel the urge to replace what you've lost.
'That's when the danger kicks in - headaches, dizziness, low blood pressure, even fainting.
'Your body can't cool itself properly, and things can go downhill fast.
"Heat makes dehydration risks ten times worse. It's even more important to stay on top of fluids during summer if you're using weight loss medication.'
In the hot weather, certain groups are at greater risk of dehydration, including older adults, babies and young children, people with chronic illness (like heart or kidney problems), those on certain medications, and individuals who are physically active in the heat.
In addition to heat stroke and kidney problems, dehydration can contribute to the development of gallstones by reducing bile flow and concentrating bile in the gall bladder.
Dr Crystal Wyllie at Asda Online Doctor explains: "Gallstones are an uncommon side effect of weight loss medication and are associated with rapid weight loss, being dehydrated can increase the risks of developing gallstones, so it's important that you remain adequately hydrated."
Other health risks to watch out for...
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If you're eating less, drinking less, and sweating more, your body can hit empty, warned Prof Joseph.
"Add in heat and you're asking for trouble - fatigue, cramps or even passing out," he added.
George Sandhu, Deputy Superintendent at Well Pharmacy, warned even mild dehydration can negatively impact your energy levels.
He said: "This can have a knock on effect on your ability to do physical activity and your overall well being, not to mention have a negative
effect on your weight loss efforts."
Some weight loss medications can also cause photosensitivity, he warned, increasing the risk of sunburn and skin damage.
He cautioned: "It's important to be fully aware of the potential side effects of taking any medication, including weight loss drugs."
What are the other side effects of weight loss jabs?
Like any medication, weight loss jabs can have side effects.
Common side effects of injections such as Ozempic include:
Nausea: This is the most commonly reported side effect, especially when first starting the medication. It often decreases over time as your body adjusts.
Vomiting: Can occur, often in conjunction with nausea.
Diarrhea: Some people experience gastrointestinal upset.
Constipation: Some individuals may also experience constipation.
Stomach pain or discomfort: Some people may experience abdominal pain or discomfort.
Reduced appetite: This is often a desired effect for people using Ozempic for weight loss.
Indigestion: Can cause a feeling of bloating or discomfort after eating.
Serious side effects can also include:
Pancreatitis: In rare cases, Ozempic may increase the risk of inflammation of the pancreas, known as pancreatitis, which can cause severe stomach pain, nausea, and vomiting.
Kidney problems: There have been reports of kidney issues, including kidney failure, though this is uncommon.
Thyroid tumors: There's a potential increased risk of thyroid cancer, although this risk is based on animal studies. It is not confirmed in humans, but people with a history of thyroid cancer should avoid Ozempic.
Vision problems: Rapid changes in blood sugar levels may affect vision, and some people have reported blurry vision when taking Ozempic.
Hypoglycemia (low blood sugar): Especially if used with other medications like sulfonylureas or insulin.
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How to stay safe
For those using weight loss jabs, Dr Wylie says it's imperative to make sure you're drinking enough water.
She explains: "It's important to drink more water than usual when taking weight-loss medication.
"Adults should aim for around two to three litres per day. This can include plain water, squash, herbal teas, or other low-sugar drinks.
"Staying hydrated helps your body manage the side effects and supports your overall health during weight loss treatments."
Prof Joseph adds: "Don't wait until you're thirsty - by then, you're already behind. Carry a big bottle with you everywhere, set reminders, and sip little and often.
'You need to hydrate slowly and consistently through the day, not chug a bottle all at once. Your body absorbs water better that way and it helps avoid energy crashes or headaches linked to dehydration.
"I recommend adding electrolytes once a day - especially in hot weather or if you're on a lower calorie diet.
"They help your body hold onto the water and replace lost minerals. And try not to rely on tea or coffee - they can be dehydrating too.'
And looking out for signs of dehydration is also important.
Dr Wylie advises: "Check your urine. It should be a pale yellow colour and darker urine may be a sign you need more fluids."
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