Modern farmer describes an attempt by a man to eat only food grown on his land. Some caveats: some grocery items and the trial lasted only 100 days. His family was less enthusiastic. The big downside: boredom. 100 broilers were to provide meat for a year, but his kids got tired of a chicken and veggie stir-fry after 3 days.
That's the point of our modern food system: incredible variety. Back in the day we ate lots of potatoes, a lot of roast beef, and a lot of overcooked vegetables. No more. No more that is unless you voluntarily trade variety for other benefits.