This is very interesting, thanks for your post! I'd like to add another point: There's a lot of other plants providing Vitamin C, not only fruits and vegetables (at least in winter our ancestors probably couldn't find so many). Wanna get rid of your Christmas tree (if it's an organic fir tree), eat the needles - full of vitamin c. You want to clean up your garden and destroy nettles and purslane? Don't! They're full of vitamin c. Even in winter you can find a lot of chickweed, which is..you know what I want to say. And there are many more options (they can vary in other countries, this is what I'm experiencing here in Germany) 🌿