I'm surprised at how these mindless studies keep on finding that if you don't eat well when you're a child, your brain won't have enough resources to fully deve

I'm surprised at how these mindless studies keep on finding that if you don't eat well when you're a child, your brain won't have enough resources to fully develop. I thought we knew this from a long time ago. How 'bout they do a study of how to feed the poor instead?