alt Hacker News"processed" is also a modern scapegoat, unfortunately.
But all three are correct, I think: Food has gotten more laden with sugar, seed oils, and carbs because it's processed to be that way after we tried to go Low Fat for so long.
A conscientious vegetarian is probably eating damn near an ideal diet by avoiding all that.
But they were eating plenty of seed oils, and sugar in cake, and loads of bread.
So mostly carbs, but with a lot of fiber. It just goes counter to the current trend in major ways. I looked through the old cookbooks. The biggest difference is no processed foods. And maybe less microplastics.