the biggest concern with eating your steak med-well or well done is the production of heterocyclic amines (HCAs) from the high heat. These have been known to produce several forms of cancer....of course, what they don't tell you is that grilled chicken produces way more HCA's anyways :frustrate
Still, a lot of "healthful" sources recommend minimally cooked meats in general. And anyways, if your not eating your steak at least med-rare or medium, why eat the steak in the first place? Next your going to tell me you'll drop the Cabernet Sauvignon as well...