>>7871
>its unviable because of nutrient demands
If it is for only you or a very small group of people, you have the machinery and the knowledge/means to grow multiple things then you can do it but with all of that i mean growing oats and barley, processing them, soaking them in water, filtering them and then drinking the water to have a milk substitute... which all can be fixed by drinking real milk which also has fats.
Chinamen deep in the woods have proven, somewhat, that a rich vegetable based diet can be done, mostly due to tofu, but then again look at what happened to the poor fellows, they are tiny, male/female look-alike and intolerant to lactose.