It’s yet another example of how a good thing can go bad: Researchers have found evidence in laboratory studies that ‘good’ cholesterol, renowned for its ability to protect against heart disease, can undergo detrimental changes in protein composition that make it ‘bad’ for the heart.

Older white men who are better able to cope with stress experience higher levels of so-called “good cholesterol” than men who are more hostile or socially isolated, according to a study released at the 115th Annual Convention of the American Psychological Association.

A team of researchers investigating cholesterol and lipid transport has performed experiments that cast serious doubt on the dominant hypothesis of how the body rids its cells of "bad" cholesterol (LDL) and increases "good" cholesterol (HDL).

Researchers at the University of Pennsylvania School of Medicine have discovered that a group of liver enzymes called proprotein convertases (PCs) may be the key to raising levels of good cholesterol (HDL-C).