The food in the United States is bad. You have to, or would have to search far and spend a great deal in order to match the freshness and purity of the groceries you can get at your local feria in Mexico. And the restaurant food here is bad, too; it is fatty and overcooked even in “good” places.
Of course, when I came to Mexico from Guatemala, I said the same of the Mexican grocery quality, as compared to the truly, amazingly, just from the garden, unadulterated, unmodified groceries they had had in Guatemala.
Still, the food in the United States is significantly worse than it is in either of these countries if you know what freshness and purity are. If you know, and you do not belong to a CSA cooperative and grow your own fruit, then you know nothing you are getting is fresh.
I knew these things and I am shocked nonetheless; I knew I was eating well these past weeks but it was really simple and inexpensive food; I did not realize exactly the high level of quality to which I was accustoming myself.