When was the Stephen King book written? I was born in 1967, and while produce was locally grown (even the stuff we got in Manhattan), things like melons weren’t available year-round, and other thing varied in quality by season. Tomatos in season were heavenly, but winter tomatos were like cardboard soaked in water. Now, tomatos are pretty much always the same, which is to say, worse in the summer, better in the winter. Unless you grow your own.
But what I really was getting at is that while the food of my very early childhood was very good (and home-cooked from scratch much more often than children have ever had since, I suspect), it went into a decline that lasted through the 90s; however, and this is just my opinion, food has improved a lot in the 21st century over the late 20th. Now, some of this is me. I became a vegetarian around 1988, and choices were extremely limited, and much of the cooking skills I had been taught didn’t include 35 ways to season beans, nor how to use a pressure cooker, albeit, my aunt and uncle in Indiana had gotten fairly adventures as far as meatless meals went, just because kosher meat was hard to get in Indiana.
Anyway, I learned to use a much broader spice palate than my mother ever dreamed existed, plus, I go to all kinds of ethnic restaurants that offer vegetarian entrees. I go to the Indian grocery, the Chinese grocery, and so forth.
I don’t know if soy hot dogs are better now than they were in 1960, because I don’t know if they existed then, but they are better than they were in 1990. Ditto commercially available yogurt (I usually make my own, though). And anything low-sugar or sugar-free got a huge boost in quality, IMO, when Splenda (sucralose) came on the market. Aspertame and saccharine just taste like chemicals to me, but I like Splenda.
If you do any niche buying, like kosher food outside of a place with a large Jewish population, or food for a medical diet, like a diabetic diet, or celiac diet, your world got a lot bigger in the 21st century.