You can be thin, vegetarian, and a marathon runner and still have your arteries calcified, according to a March 14, 2007 press release from the University of Maryland Medical Center, "University of Maryland Researchers Find Heart Disease in a Marathon Runner: Is Too Much Excercise a Bad Thing? " The press release doesn't say whether the person had been taking vitamin K-2 (MK-7) from natto, or whether the person had been taking too much vitamin D, which calcified his coronary arteries, or wh