Life Expectancy and Smartphone (2007, the first year of sedentary societization)

Due to COVID-19, life expectancy in the United States has plummeted since 2019 (see Figure 1).

But what is the reason why life expectancy, which had been continuously increasing, suddenly changed to a stagnant trend from around 2010? I interpret that the influence of smartphone use, which began to spread in 2007, is revealed after a time delay of about 3 years. The year 2007 can be seen as the first year of the rapid sedentary societization. How about in other countries? Looking at Figure 2 below, there seems to be no great difficulty in the above interpretation.

#2007 #Sedentary #Socialization #Smartphone #Life #expectancy #Postural #Science