First the doctors were warning all of us about the artery-clogging dangers of plain old cholesterol. Then we had to start keeping track of "good cholesterol" and "bad cholesterol." Now comes the latest complication: really bad cholesterol. Its scientific name is lipoprotein(a), or Lp(a), and after years of preliminary evidence, researchers have now firmly established just how bad it is. A study published in last week's Journal of the American Medical Association says high levels of Lp(a) in the blood can double a man's risk of having a heart attack before the age of 55. Worse yet, conventional cholesterol tests do...
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