The World Health Organisation says excessive weight, obesity, ageing, and population growth drove a nearly fourfold increase in worldwide cases of diabetes over the last quarter- century, affecting 422m people in 2014.

An abundance of vitamin D seems to help prevent multiple sclerosis, according to a study in more than seven million people that offers some of the strongest evidence yet of the power of the “sunshine vitamin” against MS.

Long-time tea-drinking may strengthen bones, researchers in Taiwan have found.