They are constantly sick and wasting their life away: How do I handle my parents?

EVERY TIME I CALL they say they are sick. It has been like this for an entire year!!! I'm getting irritated. They don't take care of themselves, no exercise, junk food, RX abuse (by one parent)... they do have legit illnesses, but these constant ailments are not related to their chronic health care issues. How should I confront them? They are in their 50's and wasting their life away laying in bed all of the time!