Think government and food guidelines have something to do with this. I certainly believe so. Which side is healthier? Which side eats more veggies and “healthy whole grain” ? Such BS being pushed on us today! Get the seed oils out of your life, and stop eating soybeans!!!
or look at this 70’s beach photo:
Looked up Beach scenes and got these:
1950s
1960’s : 
1980’s (70s above) :
Jogging Pop -- "ἀγων - ἀρετη" 