News from the BBC on a study by a team at Harvard Medical School has found that women who drank two or more cups of coffee a day were less likely to develop depression than those non or low coffee drinkers.

It is not clear why it might have this effect, but the authors believe caffeine in coffee may alter the brain’s chemistry. Decaffeinated coffee did not have the same effect.

The findings, published in Archives of Internal Medicine, come from a study of more than 50,000 US female nurses.

The experts are now recommending more work to better understand the link.