[chris_va]

If I am reading the original paper correctly, there is a bottleneck with the vegan diet that essentially requires you to only use cultivated cropland to get enough of a balanced diet.

The vegan curve never flattens out, because it is entirely dependent on cultivated cropland, unlike the other diets:

https://images.elementascience.org/611000.elementa.f005.PNG_...

[tjl]

Except you can use perennial sunflower which is an oilseed crop for crop rotation.

[chris_va]

I was assuming the bottleneck was protein output, but I cannot find the info in the paper at a glance.