What is definitely true that there are many, significant indicators which see similar behavior. The website mainly lists economic factors, but if you look at o

What is definitely true that there are many, significant indicators which see similar behavior. The website mainly lists economic factors, but if you look at obesity rates you see a similar trend in the 70s, where quite suddenly obesity rates start rising. https://www.mdpi.com/1660-4601/21/1/73 https://www.mdpi.com/1660-4601/21/1/73 I think that while there might not be a single common cause, it would be naive to deny that there could be a combination of events, which mark that time period in particular.