Nora Gedgaudas: It's everything. [Mainstream, commonly available supermarket food] It's a good recipe for dumbing down.
We live in a much more hostile environment than our hominid antecedents did. It's deceptively safe and friendly.
When we're sitting in our climate-controlled environments, watching celebrity bloopers, eating nutrient devoid garbage, as a means of entertainment, not giving any thought at all to the fact that these are the things that form the very compounds that run our biochemistry and neurochemistry Our brain's health [or lack thereof] define how we experience the world.