AFTER A MILLION YEARS IN WHICH IT TOOK TREMENDOUS EFFORT AND LUCK TO BE FAT, WE LIVE IN A WORLD WHERE THAT’S BEEN REVERSED: Why Are We Still So Fat?. “Whenever I see a photo from the 1960s or 1970s, I am startled. It’s not the clothes. It’s not the hair. It’s the bodies. So many people were skinny.”