This is one source corroborating your claim: https://theness.com/neurologicablog/index.php/nutrient-density-of-crops-over-time/ https://theness.com/neurologicab

This is one source corroborating your claim: https://theness.com/neurologicablog/index.php/nutrient-density-of-crops-over-time/ https://theness.com/neurologicablog/index.php/nutrient-densi... But it's good to read that whole article, because in general the availability of fruits have gone up as well.