I'm one of those "nuts" who insists that fresh produce comprises about 80% of what I eat, so that's my major source of disagreement. I have never found a way to eat like this for even 5x what you're recommending. Salads and frest fruit are definitely good staples to build any diet of. Eggs, PB&J, rice, and beef, OTOH are compromises. But that's another whole debate outside the scope of hn.
If I ate like most people then $36/month sounds difficult, but achieveable. But I don't and I wouldn't advocate changing away from eating excellence to save money.
I've been able to eat a diet of 80%+ fresh produce on $90/month.
A lot of it involved getting the reduced-almost-bad produce and cooking it day-of, state-level farmer's markets, and dumpster diving, though. Plus, being a college student where every week you can find something free...
If I ate like most people then $36/month sounds difficult, but achieveable. But I don't and I wouldn't advocate changing away from eating excellence to save money.