Weight loss reduces obese men's sleep problems

Obese men with obstructive sleep apnoea can reduce their problem by losing weight, a new study suggests.
Obstructive sleep apnea (OSA) is a common sleep apnea caused by the collapse of the upper airways during sleep. It is characterized by pauses in breathing during sleep. Each episode (apnoea) lasts for at least 10 seconds.
Moderate and severe obstructive sleep apnoea (defined as 15 or more apnoeas per hour) carries an excess risk of motor vehicle crashes, heart disease and death. Yet only one study has examined the effects of weight loss on obstructive sleep apnoea.
Now, researchers at the Karolinska Institute in Sweden have evaluated if treatment with a low energy diet reduces moderate and severe obstructive sleep apnoea in obese men.
The study involved 63 obese men (BMI 30-40) aged 30-65 years with moderate to severe obstructive sleep apnoea who were being treated with continuous positive airway pressure (a mask designed to help breathing during sleep).
Thirty men received a liquid very low energy diet for seven weeks to promote weight loss, followed by two weeks of gradual introduction of normal food. The remaining men acted as a control group by adhering to their usual diet over the nine weeks.
At the beginning of the study, both groups had a mean apnoea hypopnoea index (AHI) of 37 apnoeas per hour. At week nine, the diet group had a mean AHI of 12 events per hour compared with 35 events per hour in the control group, the researchers found.