I Am Not Politically Correct

a chronically obese guy goes to his doctor for a routine check-up. after a thorough examination, the doctor informs him that he has high blood pressure, elevated cholesterol levels and type two diabetes. fat dude ponders this for a while and then announces that he will cure all of his ailments by eating more Big Macs and drinking even more Coke. the doctor patiently puts before him evidence from all over the world that tells fatso that his strategy will result in his death. at this, lardass pounds the doctors desk, calls him a liar and ells him that his arguments lack logic. he further tells the doctor that it's his god given right to eat what he wants and as much of it as his ridiculously strained heart desires.

please tell me who's being the idiot in this scenario. please tell me who's arguments lack logic. please tell me who the liar is. please tell me who should be ashamed of his abuse of the grey cells that god bestowed upon him.