About 70 percent of people with obstructive sleep apnea are overweight or obese.  Sleep apnea worsens with increasing weight due to the reduced upper airway and fatty deposits on the muscles controlling the airway.  Inversely, losing weight can reduce the severity of obstructive sleep apnea.  A weight loss is plan is frequently recommended in conjunction with other treatment, and on a positive note, treating sleep apnea can assist with weight loss through increased energy levels and improved metabolism.