If you’re looking for evidence that today’s mass-produced vegetables don’t quite measure up to those your grandparents ate, you can find it in data published by the US Department of Agriculture.
“Of the 13 nutrients that we were able to study, we found statistically reliable declines in six of the 13,” he says. Levels of other nutrients stayed roughly constant over the years.
There’s advice on how to eat better, though they missed the obvious one: shop somewhere like this place. Better for you, and for the world. Yes, it’s a bit pricier, but only slightly so.
There’s audio of the radio segment too.
NPR : Grandma’s Veggies May Have Been More Nutritious