Weight and your health

Weight and obstructive sleep apnoea

Loud snoring, gasping at night and constant tiredness can be signs of obstructive sleep apnoea — a common condition closely linked to weight.

Published by Well Medicare, a GPhC-registered pharmacy in Marylebone, London · Last updated October 2026

Key points
  • In obstructive sleep apnoea (OSA), the throat narrows or closes repeatedly during sleep, interrupting breathing.
  • Excess weight, especially around the neck, is the biggest risk factor.
  • Losing weight can reduce how severe OSA is, and sometimes resolve it.
  • If you are diagnosed with OSA that makes you excessively sleepy, you must tell the DVLA.

Signs to look out for

  • Loud snoring, with pauses in breathing or gasping and choking noises (often noticed by a partner)
  • Feeling very sleepy during the day, even after a full night in bed
  • Waking with a headache or a dry mouth
  • Poor concentration, irritability or low mood
  • Needing to pass urine often during the night

Why weight matters

Fat around the neck and upper body narrows the airway and makes it more likely to collapse when the throat muscles relax during sleep. A collar size of more than 43 cm (17 inches) is a recognised risk factor. Other risks include being male, getting older, drinking alcohol in the evening and taking sedating medicines.

Why it is important to treat

Untreated OSA is linked with high blood pressure, heart disease, stroke and type 2 diabetes, and daytime sleepiness increases the risk of accidents. Poor sleep also increases appetite, making weight loss harder — a cycle that is worth breaking.

How weight loss helps

Losing weight reduces the pressure on the airway and can lower the number of breathing pauses per hour. For some people with mild OSA, significant weight loss resolves it; for others it makes treatment such as CPAP (a machine that keeps the airway open with gentle air pressure) more effective or reduces how much is needed.

What to do next

If you recognise these symptoms, see your GP, who can refer you for a sleep study. Obstructive sleep apnoea is a weight-related condition, so medical weight-loss treatment may be considered from a BMI of 27 — see who is eligible.

Not sure if medical weight loss is right for you?

Our free online assessment takes about five minutes. A GPhC-registered prescriber reviews it and only recommends treatment if it is safe and suitable for you.

Start the free assessment

Frequently asked questions

Do I have to tell the DVLA about sleep apnoea?

If you are diagnosed with obstructive sleep apnoea that causes excessive sleepiness affecting your driving, you must tell the DVLA and should not drive until your symptoms are controlled. Your doctor can advise you.

Can thin people get sleep apnoea?

Yes. Jaw shape, large tonsils and other factors can cause it, but excess weight is the most common cause.

Will I need CPAP forever?

Not always. Some people can reduce or stop CPAP after losing weight, but this should be confirmed with a repeat sleep study arranged by your sleep clinic.

This page is general health information. It does not replace advice from your GP or another healthcare professional who knows your history. If you have symptoms that worry you, contact your GP or NHS 111; in an emergency call 999. Prescription treatment is only supplied after an assessment by a registered prescriber.