Wow, I wonder if this is why I thought the food was so bad in San Francisco after I moved there from New Zealand. We went to a lot great restaurants, but I remember thinking that the restaurants in New Zealand was 100x better. We have an amazing cafe/restaurant scene in NZ, and I never found anything in San Francisco that could come close to a nice brunch in Auckland. (I was trying almost every place that had a good Yelp review over a period of ~2 years.) Maybe this was mostly a subconscious thing related to the mineral content of the ingredients.