As far as I can tell, that's what's actually reducing the sleep apnea. The sleep apnea was caused by the participants starting out as obese,
>participants needed a body mass index (BMI) of at least 27
>One way to overcome this discomfort while still addressing the concern was to change the treatment approach. What if we treated modifiable factors of sleep apnea, such as excess body weight, rather than just the symptoms?