Respiratory Problems: Obesity causes lungs to “become smaller” in size and chest wall become heavier to lift in the process of breathing in. The most common respiratory problem is sleep apnea. Sleep apnea is a condition where by an individual stops breathing for some time while asleep. A soft tissue in the throat collapses around the air way probably due to weight, blocking it. For the severely obese sleep apnea may get more complicated with hypoventilation. Hypoventilation is accumulation of toxic levels of carbon dioxide (the gas we breathe out) in the blood, due to inadequate breathing. Losing weight would be the only permanent safe and healthy solution to sleep apnea.