A new report by the Centers for Disease Control and Prevention shows about one third of all U.S. adults suffer from high cholesterol, but only about half of those get treatment for the disease.
Tuesday's report also said that among those who are being treated, only one-in-three people have their cholesterol under control.
Researchers studied 4,300 adults from 2005 - 2008. Participants were counted as having too much bad cholesterol if a blood test showed high levels or they said they were taking cholesterol-lowering medicine.
High cholesterol "remains out of control in this country," CDC Director Thomas R. Frieden said.
Still, the CDC noted that the latest findings were an improvement over years past. A decade ago, only one in six people with bad cholesterol were able to manage the problem. Health experts credited an increase in the use of cholesterol medications for the improvement.