alt Hacker News> where I live there were only 2 ways for achieving a diet satisfying simultaneously 3 criteria without including meat
If you want the same price or cheaper than meat, why not eat meat then?
I'm celiac, I cannot eat gluten and a GF diet can be up to 600% the price of a gluten diet - too bad for me (but not just because of the price)
It is likely that in the near future I will return to eating a moderate amount of chicken meat, after I will finish my reserves of whey protein concentrate, which were bought a long time ago, when it was cheap.
Most plant protein concentrates are not an acceptable substitute for meat, because their very high prices make obvious that their production is less efficient than that of meat, i.e. it requires a lot of extra energy and chemical reagents.
More than half of my protein intake comes from plant sources like lentils and wheat, but I cannot raise that percentage to 100%, because I gain weight immediately.
Fortunately, I do not have any problem with gluten, so I can enjoy bread that I bake at home, which is tasty and which has a negligible cost per protein content.