My father in law is in his late 70's and he is on blood thinners because he had a blood clot, he drinks beer.

he gets mad if you try to tell him not to. he drinks a 6 pk a day and has for 50 yrs. now, he has an irregular heartbeat and his heart muscles aren't strong, and the doctor wants to do a heart catherization to check for blocked arteries. why won't he stop drinking? it's just stupid!