May be of interest?

Can you be self sufficient with a perennial garden or, like hunter gatherers would you need to eat plenty of meat/fish as well?

The article is about low-maintenance gardening - not self-sufficiency. How many gardeners here grow wheat/oats? 

Steven Barstow's Blog https://www.edimentals.com/blog/ is full of plants that you never thought were edible and for ways in keeping them growing overwinter. His enormous salads  are incredible.

I don't aim to be self sufficient but I do want to convince myself that, if push came to shove, I could be and growing annuals/bi-annuals seems to be needed for this. This year, I'm growing a patch of quinoa which doesn't seem to be thriving at the moment. This, together with beans. peas, onions, garlic, carrots tomatoes, herbs and potatoes could form the basis of a reasonable diet with fruit and some greens. I'd miss oats and coffee most I think.