We had "real" bread for millennia. We didn't forget about it, we actively chose something new.Kinda. Witness the reaction of people who've eaten nothing but grocery store white bread to a nice piece of artisan bread. Also, Paul Newman used to quip, "Why go out for hamburger, when you have steak at home?" The answer to that, is that it's far easier to package, prepare, and distribute the hamburger.
We also love soda. It's not like we forgot about tea, people just like soda more.
The same goes for soda. Also, to bring it back around to Paul Newman, I also chased around some women who were clearly bad for me in retrospect. What people want is different in different contexts, over different timescales, at different ages. What you really want might be a little different than what you'd choose when just being your "id." (Cookie Monster is just the id personified. I think of Cookie Monster, Ernie, and Bert as id, ego, and superego.)