WASHINGTON — Lowering bad cholesterol levels reduces heart attack risks, and researchers have long hoped that raising good cholesterol would help, too. Surprising results from a large government study announced on Thursday suggest that this hope may be misplaced.
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The results are part of a string of studies that suggest that what doctors thought they knew about cholesterol may be wrong. Studies that track patients over time have for decades shown that patients with higher levels of high-density lipoproteins (H.D.L., or good cholesterol) tend to live longer and have fewer heart problems than those with lower levels of this cholesterol.
Not surprisingly, doctors thought that if they could raise H.D.L. levels, their patients would benefit. So far, that assumption is not panning out. Nobody knows why.
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