Uhhhhhh, I'm guessing that you were eating cheap. There's no reason that you'd have to "survive" LA cuisine unless you actually didn't spend money on it and just went to McDonalds. There are amazing restaurants in LA. Lots.
Well it was Pasadena, so Mexican or McD were the options.
Go into an American supermarket and there are dozens of types (or at least shapes) of bread - all the same oversweet soft wonderloaf inside, and dozens of types (or colors) of cheese - that all taste the same.
When I lived there, live cheese was banned, pot is being legalized but Brie is illegal !!!!