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How good is "good" cholesterol?

Researchers are now questioning how good, so-called “good” cholesterol really is.

The prevailing theory has been that the higher the levels of HDL in your blood the lower your risk of heart disease, therefore bringing up HDL levels is good for your health.

However, a new study published May 16 in the Lancet has found raising HDL levels may not actually make a difference to heart disease risk.

That is because people who naturally have higher HDL levels than normal are no less likely to suffer from heart problems.

The findings come as companies actively develop and test drugs that raise HDL.