Sir John Glubb studied various empires that existed over the last 4,000 years. He deduced that empires have predictable lifecycles, from origin to ascendence, to great power then decline and collapse. The cycle takes 250 years, give or take 50. I’m not the only one to notice that the U.S.—244 years old—may be on the decline. Decreasing life expectancies are a potential marker of decline.
Glubb died in 1986 at the age of 88.
From JAMA Network:
U.S. life expectancy increased for most of the past 60 years, but the rate of increase slowed over time and life expectancy decreased after 2014. A major contributor has been an increase in mortality from specific causes (eg, drug overdoses, suicides, organ system diseases) among young and middle-aged adults of all racial groups, with an onset as early as the 1990s and with the largest relative increases occurring in the Ohio Valley and New England. The implications for public health and the economy are substantial, making it vital to understand the underlying causes.
Source: Life Expectancy and Mortality Rates in the United States, 1959-2017 | Population Health | JAMA | JAMA Network
Steve Parker, M.D.
PS: Not many diets are proven to improve longevity. The Mediterranean diet is one.