Some napkin math:
Zero-Carb 350g/day: a 550kg ready for market cow yields 300kg of meat and fat, depending on how you model the burn rate of an adult that gives you enough energy for 12-20 months... Lets say 2600kcal/day so about 16 months - with daily protein at 100g, and fat at 250g.
I personally eat 300-500g per day on zero carb, so this math maths for me.
SAD - 1,200g/day:
Let's compare that to the standard american diet:
Estimated about 1.2kg/day
https://www.epa.gov/sites/default/files/2015-09/documents/efh-chapter14.pdf (table 14-3)
wfpb - 2,300g/day: Whole food nutritionally complete plant based eating pattern, using https://www.mdpi.com/2076-3417/16/1/257 for the nutritional template - taking their food plans for a 2,200kcal/day and scaling it up to 2,600kcal/day gives roughly 2.3kg
This puts zero carb as much more efficient energy density:
- Zero Carb (ZC) - 128kg food per year
- SAD eats 342% more, 438kg food per year
- WFPB eats 657% more, 840kg food per year
No wonder pemmican was so vital for early explorers