I concluded that rapid social and cultural change - junk food, poor sleeping patterns, a screen-based lifestyle, marketing pressures, family upheavals - were interfering with healthy development.

This appears to be a healthy development.

They found evidence that exposure to a wide range of common microbes in early life helped to promote healthy development of the immune system.

It would also be a healthy development for the economy.

But sales of chart titles are well down on last year, which means that other titles must be selling better, a reversal of recent trends, and a potentially healthy development.