Snoring, Sleep Apnoea and Weight: Why Losing 10% Can Change Your Nights
Loud snoring, gasping at night, waking unrefreshed and dozing off at your desk or behind the wheel — these can be signs of obstructive sleep apnoea, which affects close to a billion adults worldwide and is closely tied to body weight. It is also very treatable. Here is how to recognise it, how weight changes it, and what to do.
By Taha Raza
Published
In many Pakistani homes, loud snoring is a family joke. Sometimes it is harmless. But snoring with pauses, gasps and choking, followed by a day of exhaustion, can be obstructive sleep apnoea: the throat collapses during sleep, blocking airflow until the brain briefly wakes you to breathe. This can happen dozens of times an hour without you remembering it.
How common is sleep apnoea?
Very common, and mostly undiagnosed. A 2019 analysis in The Lancet Respiratory Medicine estimated that 936 million adults aged 30 to 69 worldwide have obstructive sleep apnoea, and 425 million have it at a moderate or severe level. The largest numbers were in China, the USA, Brazil and India. Men, people over 50, and people carrying weight around the neck and middle are most affected.
What are the signs of sleep apnoea?
Doctors often use the STOP-Bang questionnaire, developed in 2008 and tested against overnight sleep studies. Score one point for each 'yes'.
| Letter | Question |
|---|---|
| S — Snoring | Do you snore loudly (heard through a closed door)? |
| T — Tired | Do you often feel tired, fatigued or sleepy during the day? |
| O — Observed | Has anyone seen you stop breathing or choke during sleep? |
| P — Pressure | Do you have, or are you treated for, high blood pressure? |
| B — BMI | Is your BMI over 35? |
| A — Age | Are you over 50? |
| N — Neck | Is your neck circumference over 40 cm? |
| G — Gender | Are you male? |
A higher score means a higher chance of sleep apnoea; three or more 'yes' answers is a common threshold for seeing a doctor about a sleep study. Other clues include waking with a headache or dry mouth, getting up often to pass urine at night, poor concentration and low mood.
How does weight affect sleep apnoea?
Strongly, in both directions. The Wisconsin Sleep Cohort followed 690 working adults for four years. Compared with people whose weight stayed stable, a 10 percent weight gain predicted about a 32 percent increase in breathing pauses per hour and a six-fold increase in the odds of developing moderate-to-severe apnoea. A 10 percent weight loss predicted a 26 percent drop. For a 90 kg man, that is 9 kg — very achievable over several months.
Does losing weight cure sleep apnoea?
It can, and it nearly always helps. In the Sleep AHEAD trial, 264 adults with obesity, type 2 diabetes and sleep apnoea were assigned to an intensive lifestyle programme or standard diabetes education. After a year, the lifestyle group had lost 10.8 kg versus 0.6 kg, had about 10 fewer breathing events an hour, and more than three times as many people saw their apnoea go into total remission; severe apnoea was half as common. People who lost 10 kg or more improved most. In 2024, two NEJM trials of the weight-loss drug tirzepatide in people with obesity and moderate-to-severe apnoea found breathing events fell by about 25 an hour, compared with 5 on placebo. Weight loss does not replace CPAP for severe apnoea, but it makes everything else work better.
How is sleep apnoea treated?
- CPAP: a machine that blows air through a mask to keep the throat open. It is the standard treatment for moderate or severe apnoea and works well when used every night.
- Mouth (mandibular advancement) devices made by a dentist, mainly for mild to moderate cases.
- Weight loss through diet and exercise, and in some people medicines prescribed by a doctor.
- Sleeping on your side rather than your back if your apnoea is worse lying flat.
- Avoiding alcohol and sleeping tablets close to bedtime, which relax the throat further.
- Do not tape your mouth shut to stop snoring if you might have sleep apnoea — see our sleep guide.
Why sleep apnoea is dangerous if ignored
Repeated drops in oxygen and broken sleep raise blood pressure, strain the heart and make blood sugar harder to control. Daytime sleepiness makes driving dangerous — if you nod off at traffic signals or on the motorway, stop driving long distances until you have been assessed. It also makes weight loss harder: poor sleep increases hunger and reduces the energy to train. Treating apnoea often makes people feel dramatically better within weeks.
This article is general information, not medical advice. If you snore loudly and feel sleepy in the day, have been seen to stop breathing during sleep, or score three or more on STOP-Bang, see a doctor about a sleep study. Do not drive if you are struggling to stay awake.
Frequently Asked Questions
Can losing weight stop snoring and sleep apnoea?
Often it helps a lot. A 10 percent weight loss cut breathing pauses by 26 percent in a long-term study, and in the Sleep AHEAD trial people who lost about 11 kg were over three times as likely to see their apnoea go into remission.
How much weight do I need to lose to improve sleep apnoea?
Around 10 percent of body weight makes a measurable difference, and in Sleep AHEAD people who lost 10 kg or more improved most. Even smaller losses help, and they make CPAP work better.
What are the signs of sleep apnoea?
Loud snoring, someone seeing you stop breathing or choke during sleep, daytime sleepiness, morning headaches, waking to pass urine and high blood pressure. Three or more STOP-Bang points is a reason to see a doctor.
Is snoring always sleep apnoea?
No. Many people snore without apnoea. Snoring with pauses, gasping or choking, plus daytime sleepiness, is the pattern that suggests apnoea and needs a sleep study.
Is sleep apnoea dangerous?
Untreated, it raises blood pressure, strains the heart, worsens blood sugar control and makes drowsy-driving accidents more likely. It is very treatable with CPAP, mouth devices and weight loss.
Sources
- Benjafield AV et al. Estimation of the global prevalence and burden of obstructive sleep apnoea: a literature-based analysis. The Lancet Respiratory Medicine, 2019
- Peppard PE et al. Longitudinal study of moderate weight change and sleep-disordered breathing. JAMA, 2000
- Foster GD et al. A randomized study on the effect of weight loss on obstructive sleep apnea among obese patients with type 2 diabetes: the Sleep AHEAD study. Archives of Internal Medicine, 2009
- Malhotra A et al. Tirzepatide for the treatment of obstructive sleep apnea and obesity. New England Journal of Medicine, 2024
- Chung F et al. STOP questionnaire: a tool to screen patients for obstructive sleep apnea. Anesthesiology, 2008
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