There is good evidence that during the low-fat craze most people did not actually change their diets overall, and they added these "healthy" low-fat products on top of their unchanged diets because they're "guilt-free".

It's also a big assumption that they're always adding something worse. It's a hard sell to claim we somehow get further away from knowledge of health with every discovery.

And plenty of people in alt health circles are swinging the pendulum hard back to high-fat low-carb products and diets, and just ignoring all the evidence that led us away from this in the first place.