Snoring is often blamed on being overweight — and that’s half right, half wrong.
In this article, we take a closer look at the relationship between obesity and snoring.
Reviewed by Our Director
Kazuyuki Sugaya
Director, Ueno Snoring Clinic / Anesthesiologist
Our director, with over 20,000 general anesthesia cases, focuses primarily on the diagnosis and treatment of snoring and sleep apnea, offering care tailored to each patient. [Insurance-Covered] Ueno Snoring Clinic
This article was reviewed by our Director, Kazuyuki Sugaya, and explains accurate medical information about the testing and treatment of snoring and sleep apnea syndrome (SAS) in clear, accessible terms.
The causes of snoring range from the structure of the throat to body weight. Ueno Snoring Clinic doesn’t rely on a single treatment approach — we’re set up to recommend the best plan for each patient from a broad, evidence-based range of options.
Insurance-Covered: Thorough Testing and Ongoing Treatment
Self-Pay: Address the Root Cause, Short-Term Focus
*As a clinic specializing in snoring treatment, we work to resolve “snoring that won’t stop” through both insurance-covered and self-pay options.
Quick Answer
Obesity is one of the strongest risk factors for snoring and sleep apnea, but the relationship isn’t as simple as “heavier means louder.” Fat accumulates around the throat and, importantly, inside the tongue itself, both of which narrow or destabilize the airway during sleep. Research suggests a 5% reduction in body weight can meaningfully improve snoring and breathing pauses, and newer GLP-1 medications are showing promising results in clinical trials by reducing this fat. That said, weight loss alone doesn’t resolve every case — nasal blockages, jaw structure, alcohol use, and other factors can keep snoring going even after significant weight loss, which is why an accurate evaluation matters more than the scale alone.
📋 What This Article Covers
Why does carrying extra weight lead to louder snoring at night? It comes down to two things: physical narrowing of the airway, and the added weight of the surrounding tissue itself.
With weight gain, fat doesn’t just accumulate around the waist — it also builds up around the neck and beneath the mucous membrane at the back of the throat. This is sometimes referred to as fat deposition around the upper airway.
The upper airway — the passage air travels through — isn’t surrounded by bone; it’s a soft, flexible tube. When fat adds extra weight around that tube, it gets compressed from the outside, like a weight pressing down on it.
This effect is especially pronounced during sleep, when the muscles throughout the body relax. Without that muscle tone to resist the added weight, the airway narrows significantly, and as air is forced through the narrowed space, the surrounding tissue vibrates rapidly — producing the sound of snoring.
One factor that recent research has increasingly highlighted is fat that accumulates within the tongue itself.
The tongue is often thought of as pure muscle, but studies have shown that in people with obesity, the tongue itself can contain a substantial amount of fat. A tongue that has become larger due to fat accumulation is more affected by gravity when lying on your back, making it more likely to fall backward into the throat (a pattern known as tongue base collapse).
A University of Pennsylvania study (2020) reported a striking finding: the improvement in sleep apnea after weight loss was more strongly associated with the reduction in tongue fat than with the reduction in abdominal fat. In other words, reducing fat in the tongue itself may be one of the more meaningful keys to improving snoring.
Some people notice that their snoring is much worse than someone else’s, even at a similar BMI. This comes down to differences in where fat tends to accumulate.
It’s also worth noting that people of Asian descent, compared with Western populations, often have a smaller, more recessed jaw structure. Because of this, even a modest weight gain can push an already-narrow airway past its limit, which can make snoring worse more quickly.
Is it medically accurate to say “if you lose weight, it’ll get better”? Numerous clinical studies have looked into exactly this question.
Numerous studies, including randomized controlled trials (RCTs), have demonstrated that weight loss can meaningfully improve breathing during sleep.
For example, in a trial of men with obesity (BMI 30 or higher), an intensive very-low-calorie diet intervention was associated with a substantial reduction in the apnea-hypopnea index (AHI), a measure of how often breathing stops or becomes shallow per hour.
A separate long-term follow-up study found that participants who maintained a weight loss of 5% or more were able to prevent the age-related worsening of snoring that’s otherwise commonly seen, while those who gained weight saw their symptoms worsen rapidly.
At the same time, some people lose a significant amount of weight — even 10kg or more — and still snore. That’s because snoring often has more than one contributing cause.
When these factors play a large role, the vibration in the throat itself may persist even after significant weight loss, and snoring may not fully resolve.
GLP-1 receptor agonists (such as liraglutide and tirzepatide) have drawn significant attention in the field of obesity treatment. Originally developed as diabetes medications, they are increasingly approved and used for obesity management because of their strong weight-loss effects.
Recent academic reports and clinical trials have started to clarify how these medications may affect snoring and sleep apnea.
Liraglutide 3.0mg trial (SCALE Sleep Apnea trial): In a trial involving patients with obesity and moderate-to-severe sleep apnea, those taking liraglutide showed a significantly greater reduction in AHI compared with those on placebo.
Tirzepatide trial (SURMOUNT-OSA): More recent data suggests that tirzepatide’s strong weight-loss effect can be associated with a dramatic improvement in breathing disturbances during sleep.
An important caveat: These medications appear to improve snoring as a downstream result of reducing body weight and fat distribution — they are not a direct treatment for snoring itself. In Japan, self-pay use of these medications has become more widespread, but they should always be used under a physician’s close supervision, with careful attention to side effects (such as nausea or gastrointestinal discomfort) and medical history. Rather than treating them as a casual weight-loss shortcut, they’re best understood as one part of a broader, medically supervised strategy for improving the upper airway.
Snoring isn’t just an annoying sound — when it’s related to obesity, it can point to more serious underlying risks. Does any of the following sound familiar?
Left unaddressed, these patterns can substantially raise the risk of serious conditions, including high blood pressure, heart failure, stroke, and worsening diabetes.
Taking these two simple steps before your appointment can make your evaluation significantly more accurate.
Use a snoring-tracking app to record just one or two minutes of your actual snoring. Whether the sound is a steady “zzzz” or comes with gasping and pauses can change the recommended treatment approach.
For 2–3 nights, jot down the following:
Understanding what conditions make your snoring worse gives your doctor a valuable head start toward the most effective treatment.
“I know I should lose weight, but I want to do something about this noise right now.” We understand — and that’s why our clinic combines multiple approaches rather than relying on just one.
Snoring is, at its core, the sound of vibrating tissue around the soft palate and the back of the throat. When obesity has already narrowed the airway, that vibration tends to be even more pronounced.
Laser treatment tightens the mucous membrane that has become loose or slack, reducing how easily it vibrates.
Benefits: The procedure takes only a few minutes with minimal downtime, and results can often be noticed quickly.
Why it matters for weight management, too: Losing weight takes time. Reducing the noise and improving sleep quality with laser treatment first — while working on weight loss in parallel — is often a realistic and practical approach.
When obesity is the primary driver of someone’s snoring, treating the throat alone can only go so far.
Our clinic also offers consultations for medically supervised weight management using GLP-1 receptor agonists, under a physician’s oversight.
Goal: To reduce subcutaneous and visceral fat — as well as fat in the tongue — creating more physical space in the airway.
Approach: Combined with dietary guidance, medically supervised support helps aim for sustainable weight loss with a lower risk of rebound weight gain.
We assess each patient individually to determine what’s primarily driving their snoring.
Obesity and snoring are closely linked — but that doesn’t mean you have to simply wait until you’ve lost the weight to do anything about it.
By understanding the structure of the upper airway, the role of tongue fat and fat distribution, and by making informed use of modern options like laser treatment and medically supervised weight management (including GLP-1 therapy), it’s possible to move toward quieter, deeper sleep — for you and for anyone sleeping beside you.
Why not start by simply recording your own snoring? That first step could be the turning point toward a healthier night’s sleep — and a longer, healthier life.
English Support Available
We provide medical services for international patients. Please check our English website for details on how to visit our clinic.
Supervising Physician
Kazuyuki Sugaya, Director of Ueno Snoring Clinic
After graduating from Fujita Health University School of Medicine in 2004, Dr. Sugaya began his career as an anesthesiologist at Toho University Omori Medical Center. He has since gained extensive clinical experience at municipal hospitals and private clinics nationwide, administering general anesthesia in over 20,000 cases. In 2020, he founded the "Tokyo Spine Clinic," and has served as the Director of Ueno Snoring Clinic since 2025.
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Specialized Snoring Treatment in Ueno
Ueno Snoring Clinic
Insurance-covered home testing available.
Following a physician’s consultation and result explanation,
we support the improvement of snoring and sleep apnea with "Dual Deep Thermia"—a non-surgical laser treatment, if necessary.
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