And reasonably so. Partly, this is because the "best diet" at any given time depends on practical factors like availability and affordability. Both of those hav

And reasonably so. Partly, this is because the "best diet" at any given time depends on practical factors like availability and affordability. Both of those have been rapidly improving, I think, for much of the world. I can buy food today that, to my grandparents or even parents, was unheard-of or only-eaten-by-kings. e.g. the value of quinoa or blue-green algae in a diet probably makes sense to study now, but it probably didn't 50 years ago