One type of HDL ('good') cholesterol exhibits a previously unknown role in protecting the liver from injury. HDL3 supports the liver by blocking inflammation produced by some gut bacteria.

A new gene therapy protects optic nerve cells to preserve eye health in a study with mice, which could help support vision with age.

Researchers looked at more than 16,000 gut microbiome profiles from baboons in Kenya, finding that gut bacteria are heritable, although environmental factors do still play a larger role than genetics.

The largest study of its kind (386,258 coffee drinkers) found no evidence that moderate coffee consumption can cause cardiac arrhythmia (abnormal heart rhythms.)