And people simply didn't eat fresh greens or uncooked veggies in third
world countries. Nothing has changed in that area. Why would people
think things have changed? More intelligence on Earth?

The last nomads in southern Africa (later 1960's, early 1970's) were known to
eat upwards of 300 difference species of plants, and 60 species of animals,
without health problems associated with nutrition. By mid 1990's, they were
"domesticated" and eating about 7 species of plants and 4 or 5 species of
animals, and did indeed have nutritional associated health problems.