National Heart, Lung, and Blood Institute. Identification, Evaluation, and Treatment of Overweight and Obesity in Adults. NIH Publication number 00-4084. October 2000. Page 11.
About 70% of persons with obstructive sleep apnea are overweight or obese. Weight loss in such persons is normally encouraged.
Surprisingly, there have been few formal studies of how effectively weight loss improves snoring and sleep apnea. Nevertheless, striking improvements in both sleep apnea and snoring have been observed in persons who lose weight.
In some situations a physician may wish to prescribe weight loss medications to an overweight or obese patient with sleep apnea.