Idk about studies, but we have a 10x20 garden plus numerous fruit trees, and it hardly feeds us for a few days look. We end up growing a lot of tomatoes, cucumber, and other stuff that can easily be canned like pasta/pizza sauce, salsa, pickles, jellies/jams, etc cuz we either can’t eat it all when ripe and a lot goes bad, or we eat what we can and freeze it. We also use a lot of the stuff for our pets (making food) that’s ripe but maybe not pleasant looking lol. We spent so much on a deep freezer, canning supplies, storage racks it takes a couple years to recoup the costs.

Other than that, it does feel good to be partially self-sustainable. Its also nice in the summer to walk outside and just eat stuff fresh off the vine! Plus no preservatives.