This is quite interesting (IMHO):
Pick heirloom and organic varieties, if you can afford it. “Traditional plant varieties tend to be more nutrient-dense compared to high-yield commercial crops,” she says. “Organic farming practices also promote healthier soil.” The downside is these tend to be more expensive.
Focus on local and seasonal produce. “Nutrients degrade over time, so buying freshly harvested, locally grown produce reduces nutrient loss from storage and transport,” Avena says.
Support companies focused on regenerative agriculture. “Practices like crop rotation, composting and reduced tillage help restore soil nutrients, leading to healthier crops,” she says.
This was one of the things Michael Pollen’s book In defense of Food talked about.
Fruit and vegetables don’t taste as good as they used to. What happened?
Same answer.
Also, not true in every country.
Fruits and vegetables were bred to be easy to grow and disease and insect resistant, not tasty and nutritious. I think this is mostly good for the world—especially poor people—because it makes food cheaper, though I’m not sure Rene Rezdepi agrees. (This is a huge theme of Omnivore.). Lots of tradeoffs in life. Policy is not as simple as people make it out to be.
Modern produce in the US is bred for uniform size and appearance, and to hold up when shipped and stored.
Monoculture, petroleum-based industrial farming, glyphosate, and depleting the soil aren’t good for anyone in the long run.