Snoring & OSA

How Does Weight Loss Play a Role in Obstructive Sleep Apnoea

January 16, 2020
weight loss sleep apnoea

In Singapore, the percentages of the adult population who are overweight are around 32% for men and 22% for women. And according to the Health Promotion Board, 1 in 10 Singaporeans between 18 to 69 years old is obese. While excess weight puts one at risk for a number of health conditions, it is also the strongest risk factor that’s associated with Obstructive Sleep Apnea (OSA). In fact, it was found that over half of the people who have OSA are overweight or obese.


Let’s explore more on the link between weight and OSA, and how losing weight can have a significant effect in managing the condition.



The risk of having OSA increases with weight


 OSA is a disorder in which breathing is interrupted or stopped repeatedly during sleep. This brief pause in breathing can last for at least 10 seconds. It occurs when the muscles around the upper airway (or breathing passage) relax and partially or completely block the upper airway for a short period of time during sleep.

Putting on the extra pounds increases the chance of having the disorder because there will be more fat tissues around the neck and throat region, causing a narrower breathing passageway and makes it susceptible to collapse during sleep. Those with a larger neck circumference (more than 17 inches for men and 16 inches for women) may have excess fat deposits near the upper airway that can obstruct breathing. When the air has to squeeze through the narrowed or blocked airway, it is often heard as snoring, gasping or snorting.



A vicious cycle between weight gain and the lack of sleep




Having adequate and uninterrupted sleep will keep you feeling well-rested, but adults with OSA may experience impaired concentration, fatigue, and excessive sleepiness during daytime. Poor sleep quality due to OSA can contribute to weight gain and lower energy levels. If you’re constantly fatigued and feeling tired, you might not have the motivation and energy to engage in physical activities. Therefore, it can be more difficult for people with OSA to lose weight, and at the same time, having excess weight will cause breathing difficulties during sleep. Thus, the cycle continues.


A definitive sleep study is needed to diagnose and determine OSA. This involves a consultation with an ENT specialist who will take your medical history and conduct a physical examination. The sleep study will monitor and record the body’s activity during sleep overnight, including breathing patterns, brain waves, heart rate and limb movements. This can be done at home, in a sleep laboratory or in a hospital.


The gold standard for managing OSA is using Continuous Positive Airway Pressure (CPAP) therapy – a mask-like device that is worn throughout the night during sleep. A machine pumps air through the tube and mask worn on the nose or face, creating “positive pressure” to keep the upper airway open and helps prevent snoring. When sleep apnoea is managed and under control, you can gain better quality of sleep and have more energy to exercise and lose weight.



Does OSA go away after weight loss?



Osa Image


For those who are overweight, losing the excess weight and maintaining an ideal BMI can help control sleep apnoea. The ideal BMI for Asians should be less than 23.5. Losing weight does help reduce or improve the severity of OSA in overweight patients.  However, if there are other underlying structural cause for your OSA (e.g. large tonsils and adenoids, persistent nasal blockage), weight loss alone will not cure your sleep apnoea.


An ENT specialist will assess your condition to determine the likely cause of OSA and recommend the appropriate treatment. If left untreated, it increases the risk of serious complications such as hypertension and heart disease. If you think you might have OSA, consult with an ENT doctor for your snoring issues.



Medically reviewed by Dr Gan Eng Cern

When Should You See an ENT Specialist in Singapore?

  • Any ear, nose or throat symptoms that you are troubled with or concerned about
  • Persistent blocked nose with mouth breathing or snoring

Dr Gan Eng Cern

Dr Gan Eng Cern is a distinguished ENT doctor with fellowship training. In addition to his clinical practice as an ear, nose and throat specialist in Singapore, Dr. Gan has contributed to the academic field as a Senior Clinical Lecturer at the Yong Loo Lin School of Medicine, National University of Singapore. He is recognised for his extensive research work, with numerous contributions to reputable international ENT journals. Dr Gan is also highly sought after as a speaker and has shared his surgical knowledge as a surgical dissection teacher at various prominent ENT conferences and courses.


  • 2020 – Reader’s Choice Gold Award for Best ENT Specialist (Expat Living Singapore)
  • 2016 – Best Educator Award (Eastern Health Alliance)
  • 2016 – “Wow” Award (Patient Compliment)
  • 2014 – Eastern Health Alliance Caring Award – Silver
  • 2014 – 19th Yahya Cohen Memorial Lectureship (awarded by the College of Surgeons, Academy of Medicine Singapore for best scientific surgical paper)
  • 2012 – Human Manpower Development Award (Ministry of Health, Singapore)
  • 2007 – Singhealth Best Doctor Award


  • MBBS – Bachelor of Science, Bachelor of Medicine, Bachelor of Surgery (University of New South Wales, Sydney, Australia)
  • MRCS (Edin) – Member of the Royal College of Surgeons Edinburgh, United Kingdom
  • MMed (ORL) – Master of Medicine in ENT (National University of Singapore)
  • FAMS – Fellow of the Academy of Medicine Singapore

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