I didn't downvote, but I can imagine that most people weren't aware of that claim. I'm skeptical of it as well since I'm not aware of any research that shows fructose in fruit increasing over time.
https://www.scientificamerican.com/article/soil-depletion-an...
If you don't believe food is sweeter and less nutritious, you're firing a shot at many-billion-dollar industries that have been earnestly been trying to optimize the above for all that time.
It's not a pleasant thing to believe, but its hard to refute.
IIRC, You should be able to do your own deep dives here:
https://fdc.nal.usda.gov/food-search?type=SR%20Legacy&query=
Refute what? There still hasn't been any evidence provided for this claim.
The food industry, like any other industry, focuses on numbers. Consumer spending favors new varieties of fruit with sweeter taste (e.g., increased glucose/fructose content). This process has led to our current comical situation where fruit, which is perceived as natural, has become unfit for consumption by animals.
>Fruits have gotten too sweet for some animals and zookeepers have had to find alternative foods.
https://weather.com/news/news/2018-10-03-fruit-so-sweet-zoo-...
Now a Granny Smith apple here may be different to the Granny Smith apple I used to eat but this is just to illustrate that I am not comparing two different kinds of apples.
I remember eating strawberries directly from the plant, and they were sweet. However, my aunt would serve the same strawberries with sugar as an afternoon snack.