Li said that it would have been beneficial for our ancestors to be intensely interested in how attractive, successful and popular people were doing, so they could compete with them for mates.
That's all very well in a small village. But modern media expose us to a much wider social circle, and push our appetite for gossip to extreme levels.
"Fashion models, celebrities and television characters are not actually our peers. Their presence makes us look to standards that are largely unattainable or ultimately harmful," New Scientist quoted Li as saying.
Trying to compete with such a wide social circle can lead to psychological problems such as eating disorders, workaholism and depression, but according to Li, evolution has hard-wired us to do it anyway.
The study has been published in Evolution and Human Behavior.
Source-ANI