Does Zepbound Make You Cold?

While it’s not listed as a common side effect on the official label, many patients have turned to Reddit forums and support groups to discuss persistent chills or an unusual sensitivity to cold after starting Zepbound. This anecdotal evidence has raised a real question: Does Zepbound make you cold, or is this a side effect of weight loss?

If you’re taking Zepbound injections and can’t seem to shake the chills, this article explores why some Zepbound users feel unusually cold and what you can do if it happens to you.

Does Zepbound Make You Cold?

Feeling cold while taking Zepbound isn’t officially listed as a common side effect, but some people have reported experiencing chills, sensitivity to cold, or feeling unusually cold during treatment.

Here are a few possible explanations for why you might feel cold on Zepbound:

1. Loss of insulating fat

Zepbound helps you lose a lot more fat than muscle. A study looked at the body composition of participants who took Zepbound. In those who took it for 72 weeks, about 75% of the weight lost was fat, and 25% was lean mass.

Your body fat can help protect you from feeling cold. If you have more body fat, you’re likely to feel warmer indoors because fat slows down heat loss and helps keep your body temperature stable.

That’s why experts believe that larger body size and higher body fat were important evolutionary traits for surviving in cold climates. It’s likely an adaptation that helps them stay warm and handle the cold better.

In a study, researchers wanted to understand how women respond to cold water compared to men. However, they found that fat mattered more than gender. When they grouped men and women who had similar body fat levels, there were no major differences between them in how fast their core temperatures dropped or how much energy they used. The more body fat someone had, the less they needed to shiver to stay warm.

2. Reduced food intake and thermogenesis

Zepbound reduces appetite, and eating fewer calories can reduce thermogenesis. When you eat, your body uses energy to digest and process food, a process called the thermic effect of food (TEF). Less food means less TEF, so slightly less internal heat is generated. However, the amount of heat lost from reduced TEF is relatively small and may not fully explain the sensation of feeling cold.

3. Hormonal shifts

Another possible reason is due to hormonal changes triggered by the drug’s effects on your brain and metabolism.

Zepbound is a GLP-1 and GIP receptor agonist, meaning it mimics the actions of natural hormones that help regulate appetite, insulin, and energy use. However, studies suggest that these hormones also interact with brain regions like the hypothalamus, which helps regulate body temperature.

When Zepbound changes the activity of certain hypothalamic neurons, it may also change how your body responds to cold or conserves heat. This shift in signaling may cause your body to reduce internal heat production or become more sensitive to cooler temperatures.

At the same time, eating less and losing weight can lower levels of hormones like leptin, thyroid hormones, and insulin. These hormones help manage your metabolism and influence how much heat your body generates. As they drop, your metabolism may slow down, and with it, your heat output. This response is the body’s way of conserving energy during times of reduced calorie intake, but it can also make you feel colder than usual.

Though not yet fully understood, there may be a link between these hormonal changes and thermoregulation.

Is Feeling Cold a Side Effect of Other Weight Loss Drugs?

Zepbound isn’t the only medication of its kind. Similar medications include:

• • Ozempic (semaglutide, for diabetes)
  • Wegovy (semaglutide, for weight loss)
  • Mounjaro (tirzepatide, for diabetes)
  • Saxenda (liraglutide)
  • Trulicity (dulaglutide)

Among these, users of Wegovy and Ozempic have also reported feeling cold. This suggests the issue may be common across the GLP-1 class, not just unique to Zepbound. However, Zepbound’s dual-hormone targeting (GLP-1 and GIP) may amplify this sensation compared to single-hormone GLP-1 agonists.

In a Reddit thread, a user shared that during their 8th week on Ozempic, they were experiencing intense coldness and body aches, despite being indoors at a mild temperature of 72°F. This symptom came alongside the typical effects of appetite loss and reduced food intake. The post was intended to ask others whether feeling cold on Ozempic was common.

The majority of commenters confirmed that they too experienced persistent or unusual coldness after starting Ozempic. Some mentioned shivering at night, needing extra blankets, and wearing sweaters or socks even in warm weather or air-conditioned rooms. Several noted that this coldness was one of the earliest or most consistent side effects they felt.

Many users attributed the cold to losing fat and consuming fewer calories. Those who lost significant weight (e.g., 50 lbs, 98 lbs, or even 144 lbs) said they noticed being cold more often, even in climates or seasons where they’d normally feel warm. A few jokingly referred to it as losing their “seal-like blubber” or “inner insulation.”

A couple of people also mentioned noticing a return to normal warmth after stopping Ozempic.

In another post, a user who had their thyroid removed 12 years ago shared that after losing 79 lbs on Mounjaro, they constantly feel cold. Despite living in a cold area (Buffalo, NY), they noted this chilliness is extreme, even at home with the heat on, they layer up with sweats, blankets, and sometimes a scarf. They asked if others on Mounjaro have experienced similar sensations.

Several users, including those who had only lost minimal weight, began feeling cold within weeks of starting Mounjaro. Others said they felt warmer again after discontinuing the medication, suggesting the drug itself may contribute independently of weight changes.

One user pointed to a video explaining how GLP-1 drugs might affect the brain’s thermoregulation mechanisms:

People described how this new sensitivity to cold altered their routines. Some now wear heated gloves or use desk warmers at work, while others avoid certain rooms due to draftiness. Heated clothing, electric blankets with timers, and even fleece-lined leggings were popular solutions. A few joked about looking like they’re dressed for Arctic expeditions while indoors.

What to Do If You’re Constantly Cold While Taking Zepbound

If the cold becomes disruptive, here are a few things you can try:

• • Dress in layers, even indoors.
  • Use heated blankets or hand warmers for temporary relief.
  • Drink warm fluids regularly, including herbal tea or broth.
  • Eat small, warm meals instead of cold salads or smoothies.
  • Avoid fasting excessively, as it can make the sensation worse.
  • Move around frequently to stimulate blood flow and body heat.
  • Track your weight and symptoms to share with your doctor.

How Long Does Zepbound Make You Cold?

The cold sensation doesn’t have a fixed timeline. It really depends on how your body responds. But here’s what you can generally expect:

Should You Stop Taking Zepbound If You Feel Cold?

Not necessarily. Feeling colder is often just a normal response to weight loss and metabolic change. However, if it comes with symptoms like fatigue, dizziness, hair loss, or slow heart rate, it’s worth checking with your doctor to rule out thyroid issues or nutritional deficiencies.

Other Uncommon Side Effects of Zepbound

Alongside feeling cold, some users have reported:

• • Hair thinning
  • Fatigue
  • Changes in taste
  • Mood shifts

Though these aren’t part of the standard side effect list, they’ve been mentioned in user reviews and forums. Just like the chilliness, they may be secondary to rapid weight loss or hormonal changes, not necessarily caused directly by the medication.

Wrap-up

Feeling cold while taking Zepbound is most likely due to reasons that include fat loss, eating fewer calories, and hormonal changes that affect how your body regulates temperature.

This side effect isn’t unique to Zepbound. People taking Ozempic, Wegovy, and Mounjaro also report feeling unusually cold. That suggests it’s likely related to how these medications work, not just the weight loss.

For most people, the cold feeling starts early and can last throughout treatment. Some adjust over time, while others stay cold unless they stop the drug. If it becomes disruptive, layering up, eating warm meals, and moving more often can help. Talk to your doctor if the cold comes with other symptoms like fatigue or hair loss.

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