It's considered to be an advantage to have lungs with increased capacity, because with increased capacity
a. the chest looks more "buff."
b. anaerobic exercise is easier.
c. the lungs will fight off colds and influenza.
d. the lungs can better exchange oxygen and waste products in the blood.

Explanation:

Lungs with increase capacity actually helps to a better exchange of oxygen and waste products in the blood, because lungs have the function of exchanging oxygen for carbon dioxide. You inhale oxygen and exhale carbon dioxide.

Moreover, the oxygen you take is going directly to bloodstream and is carried all over the body, giving oxygen to all cells, tissues, muscles, during this process, the oxygen taken by cells is replaced by carbon dioxide, which is the waste, then the bloodstream carries this waste back to the lungs to be expelled.

you spelled it wrong - it's obesity.   there is a lot of info on this topic on line.   just google some health articles.  

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