True, fruit and nut-based food forests, like those in the Pacific Northwest [1], seem to provide a significant, sustainable food source. Berries make a nice dessert + vitamins a few times a year.
Historically here in Maine, the core diet seems to have been seafood, freshwater fish, maize, Capreolinae, game birds, eggs, honey, roots, and greens. While only a tiny fraction of fish/seafood remain, deer are over-populated and make a fine sustainable food source, the limitation mostly being the contemporary appetite for venison.
The edible himalayan blackberry infestation that plagues all of the coastal PNW is widely available. It's almost impossible to kill and it fruits for long periods of time.
Historically here in Maine, the core diet seems to have been seafood, freshwater fish, maize, Capreolinae, game birds, eggs, honey, roots, and greens. While only a tiny fraction of fish/seafood remain, deer are over-populated and make a fine sustainable food source, the limitation mostly being the contemporary appetite for venison.
1. https://www.smithsonianmag.com/smart-news/indigenous-peoples...