Obese people generally have less mobility. Like sit or sleep Lungs are not fully expanded. Can cause infections of the respiratory tract, more often than normal.
Obese people often have less motion than sit or sleep, like the lungs, so the expansion is not that it causes complications, infections are more frequent loss of normal dai.
There is always a little fat man move like to sit or lie down more than Lung expansion is not so full, cause Infection of respiratory share provided more frequently.